`iree_get_platform` return just `${IREE_ARCH}-${CMAKE_SYSTEM_NAME}` (#12699)

Fixes #12692
diff --git a/build_tools/cmake/iree_run_module_test.cmake b/build_tools/cmake/iree_run_module_test.cmake
index 349228f..facf56c 100644
--- a/build_tools/cmake/iree_run_module_test.cmake
+++ b/build_tools/cmake/iree_run_module_test.cmake
@@ -5,16 +5,11 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 # Utility function to return the platform name in crosscompile.
-# TODO(#12692): stop leaking CMAKE_SYSTEM_PROCESSOR values.
+# List of CMAKE_SYSTEM_NAME values:
+#   https://gitlab.kitware.com/cmake/cmake/-/issues/21489#note_1077167
+# Examples: arm_64-Android arm_32-Linux x86_64-Windows arm_64-iOS riscv_64-Linux
 function(iree_get_platform PLATFORM)
-  if(ANDROID AND CMAKE_ANDROID_ARCH_ABI STREQUAL "arm64-v8a")
-    set(_PLATFORM "android-arm64-v8a")
-  elseif(IREE_ARCH STREQUAL "x86_64")
-    set(_PLATFORM "x86_64")
-  else()
-    set(_PLATFORM "${CMAKE_SYSTEM_PROCESSOR}-${CMAKE_SYSTEM_NAME}")
-  endif()
-  set(${PLATFORM} "${_PLATFORM}" PARENT_SCOPE)
+  set(${PLATFORM} "${IREE_ARCH}-${CMAKE_SYSTEM_NAME}" PARENT_SCOPE)
 endfunction()
 
 # iree_run_module_test()
@@ -34,13 +29,10 @@
 #       containing the same.
 #   LABELS: Additional labels to apply to the test. The package path and
 #       "driver=${DRIVER}" are added automatically.
-#   XFAIL_PLATFORMS: List of platforms (all, x86_64, android-arm64-v8a,
-#       riscv64-Linux, riscv32-Linux) for which the test is expected to fail
-#       e.g. due to issues with the upstream llvm backend. The target will be
-#       run, but its pass/fail status will be inverted.
-#   UNSUPPORTED_PLATFORMS: List of platforms (x86_64, android-arm64-v8a,
-#       riscv64-Linux, riscv32-Linux) not supported by the test target. The
-#       target will be skipped entirely.
+#   XFAIL_PLATFORMS: List of platforms (see iree_get_platform) for which the
+#       test is expected to fail. The test pass/fail status is inverted.
+#   UNSUPPORTED_PLATFORMS: List of platforms (see iree_get_platform) for which
+#       the test is skipped entirely.
 #   DEPS: (Optional) List of targets to build the test artifacts.
 #   TIMEOUT: (optional) Test timeout.
 #
@@ -73,8 +65,8 @@
 #   EXPECTED_OUTPUT
 #     "mobilenet_v1_fp32_expected_output.txt"
 #   UNSUPPORTED_PLATFORMS
-#     "android-arm64-v8a"
-#     "riscv32-Linux"
+#     "arm_64-Android"
+#     "riscv_32-Linux"
 # )
 
 function(iree_run_module_test)
@@ -226,10 +218,10 @@
 #       iree-run-module
 #   LABELS: Additional labels to apply to the test. The package path and
 #       "driver=${DRIVER}" are added automatically.
-#   XFAIL_PLATFORMS: List of platforms (all, x86_64, android-arm64-v8a,
-#       riscv64-Linux, riscv32-Linux) for which the test is expected to fail
-#       e.g. due to issues with the upstream llvm backend. The target will be
-#       run, but its pass/fail status will be inverted.
+#   XFAIL_PLATFORMS: List of platforms (see iree_get_platform) for which the
+#       test is expected to fail. The test pass/fail status is inverted.
+#   UNSUPPORTED_PLATFORMS: List of platforms (see iree_get_platform) for which
+#       the test is skipped entirely.
 #   TIMEOUT: (optional) Test timeout.
 #
 # Example:
diff --git a/build_tools/python/cmake_builder/rules_test.py b/build_tools/python/cmake_builder/rules_test.py
index 7e1600f..5b0f7f4 100644
--- a/build_tools/python/cmake_builder/rules_test.py
+++ b/build_tools/python/cmake_builder/rules_test.py
@@ -156,7 +156,7 @@
         runner_args=["--x=0", "--y=1"],
         timeout_secs=10,
         labels=["defaults", "e2e"],
-        xfail_platforms=["arm", "ppc"])
+        xfail_platforms=["arm_64-Android", "riscv_32-Linux"])
 
     self.assertEqual(
         rule,
@@ -180,8 +180,8 @@
             "defaults"
             "e2e"
           XFAIL_PLATFORMS
-            "arm"
-            "ppc"
+            "arm_64-Android"
+            "riscv_32-Linux"
         )
         """))
 
diff --git a/build_tools/python/e2e_model_tests/test_definitions.py b/build_tools/python/e2e_model_tests/test_definitions.py
index 06ec132..c2810c7 100644
--- a/build_tools/python/e2e_model_tests/test_definitions.py
+++ b/build_tools/python/e2e_model_tests/test_definitions.py
@@ -18,10 +18,10 @@
 
 class CMakePlatform(enum.Enum):
   """Enum of CMake system platform string."""
-  ANDROID_ARMV8_A = "android-arm64-v8a"
-  LINUX_RISCV32 = "riscv32-Linux"
-  LINUX_RISCV64 = "riscv64-Linux"
-  LINUX_X86_64 = "x86_64"
+  ANDROID_ARMV8_A = "arm_64-Android"
+  LINUX_RISCV32 = "riscv_32-Linux"
+  LINUX_RISCV64 = "riscv_64-Linux"
+  LINUX_X86_64 = "x86_64-Linux"
 
 
 # Compile config used for each CMake system platform.
diff --git a/tests/e2e/models/generated_e2e_model_tests.cmake b/tests/e2e/models/generated_e2e_model_tests.cmake
index daf6550..2157e2e 100644
--- a/tests/e2e/models/generated_e2e_model_tests.cmake
+++ b/tests/e2e/models/generated_e2e_model_tests.cmake
@@ -12,8 +12,8 @@
   EXPECTED_OUTPUT
     "mobilenet_v1_fp32_expected_output.txt"
   MODULES
-    "riscv64-Linux=iree_MobileNetV1_fp32_module_e80d71ed8e86c0756226b2323e27e2c7c0fff8eddde59ba69e9222d36ee3eef6/module.vmfb"
-    "x86_64=iree_MobileNetV1_fp32_module_02cebfbec13685725c5b3c805c6c620ea3f885027bfbb14d17425798e391486f/module.vmfb"
+    "riscv_64-Linux=iree_MobileNetV1_fp32_module_e80d71ed8e86c0756226b2323e27e2c7c0fff8eddde59ba69e9222d36ee3eef6/module.vmfb"
+    "x86_64-Linux=iree_MobileNetV1_fp32_module_02cebfbec13685725c5b3c805c6c620ea3f885027bfbb14d17425798e391486f/module.vmfb"
   RUNNER_ARGS
     "--function=main"
     "--input=1x224x224x3xf32=0"
@@ -28,9 +28,9 @@
   EXPECTED_OUTPUT
     "efficientnet_int8_expected_output.txt"
   MODULES
-    "riscv32-Linux=iree_EfficientNet_int8_module_f963d812114af925e0a4b110ee83aeb0e3b41d49fad19b3f449b6a9ccba43b8d/module.vmfb"
-    "riscv64-Linux=iree_EfficientNet_int8_module_e850fce2d36ddb09ccc34471641adb77418b93c0949d22ab75806d7cfc489ae3/module.vmfb"
-    "x86_64=iree_EfficientNet_int8_module_3926415c1504dfc277674fee17bdfbd68090634b8b52620d8d5755082a89a16d/module.vmfb"
+    "riscv_32-Linux=iree_EfficientNet_int8_module_f963d812114af925e0a4b110ee83aeb0e3b41d49fad19b3f449b6a9ccba43b8d/module.vmfb"
+    "riscv_64-Linux=iree_EfficientNet_int8_module_e850fce2d36ddb09ccc34471641adb77418b93c0949d22ab75806d7cfc489ae3/module.vmfb"
+    "x86_64-Linux=iree_EfficientNet_int8_module_3926415c1504dfc277674fee17bdfbd68090634b8b52620d8d5755082a89a16d/module.vmfb"
   RUNNER_ARGS
     "--function=main"
     "--input=1x224x224x3xui8=0"
@@ -45,9 +45,9 @@
   EXPECTED_OUTPUT
     "deeplab_v3_fp32_input_0_expected_output.npy"
   MODULES
-    "android-arm64-v8a=iree_DeepLabV3_fp32_module_f06fff09f8cebc27d1674045712aaa60afe7aef388c4bc505897f55c3a0d8abb/module.vmfb"
-    "riscv64-Linux=iree_DeepLabV3_fp32_module_68f0eb37bb72d0d6605ecdf42691c64125960e122844b0beeae350871a445b1c/module.vmfb"
-    "x86_64=iree_DeepLabV3_fp32_module_87aead729018ce5f114501cecefb6315086eb2a21ae1b30984b1794f619871c6/module.vmfb"
+    "arm_64-Android=iree_DeepLabV3_fp32_module_f06fff09f8cebc27d1674045712aaa60afe7aef388c4bc505897f55c3a0d8abb/module.vmfb"
+    "riscv_64-Linux=iree_DeepLabV3_fp32_module_68f0eb37bb72d0d6605ecdf42691c64125960e122844b0beeae350871a445b1c/module.vmfb"
+    "x86_64-Linux=iree_DeepLabV3_fp32_module_87aead729018ce5f114501cecefb6315086eb2a21ae1b30984b1794f619871c6/module.vmfb"
   RUNNER_ARGS
     "--function=main"
     "--input=1x257x257x3xf32=0"
@@ -63,9 +63,9 @@
   EXPECTED_OUTPUT
     "1x2xi8=[72 -72]"
   MODULES
-    "riscv32-Linux=iree_PersonDetect_int8_module_1ef2da238443010024d69ceb6fe6ab6fa8cf5f4ce7d424dace3a572592043e70/module.vmfb"
-    "riscv64-Linux=iree_PersonDetect_int8_module_14a15b9072caaee5e2a274a9bbc436a56d095611e5a8e9841f110741d34231f9/module.vmfb"
-    "x86_64=iree_PersonDetect_int8_module_eb56e91246a131fa41bd335c1c072ffb6e7ffe651ecf65f4eeb171b12848b0ed/module.vmfb"
+    "riscv_32-Linux=iree_PersonDetect_int8_module_1ef2da238443010024d69ceb6fe6ab6fa8cf5f4ce7d424dace3a572592043e70/module.vmfb"
+    "riscv_64-Linux=iree_PersonDetect_int8_module_14a15b9072caaee5e2a274a9bbc436a56d095611e5a8e9841f110741d34231f9/module.vmfb"
+    "x86_64-Linux=iree_PersonDetect_int8_module_eb56e91246a131fa41bd335c1c072ffb6e7ffe651ecf65f4eeb171b12848b0ed/module.vmfb"
   RUNNER_ARGS
     "--function=main"
     "--input=1x96x96x1xi8=0"