Replace openxla/iree with iree-org/iree across the project. (#17110)

As part of [moving IREE out of
OpenXLA](https://groups.google.com/g/iree-discuss/c/kdFr4CQwEyY/m/PWJIpZlRBQAJ),
we moved the repository from the [openxla GitHub
organization](https://github.com/openxla) to the [iree-org GitHub
organzation](https://github.com/iree-org).

This updates all occurances of `openxla/iree` to `iree-org/iree` in the
project. Most of these should be handled by redirects.
diff --git a/build_tools/cmake/build_and_test_tsan.sh b/build_tools/cmake/build_and_test_tsan.sh
index 029ec7c..b711adf 100755
--- a/build_tools/cmake/build_and_test_tsan.sh
+++ b/build_tools/cmake/build_and_test_tsan.sh
@@ -55,7 +55,7 @@
 # Disable actually running GPU tests. This tends to yield TSan reports that are
 # specific to one's particular GPU driver and therefore hard to reproduce across
 # machines and often un-actionable anyway.
-# See e.g. https://github.com/openxla/iree/issues/9393
+# See e.g. https://github.com/iree-org/iree/issues/9393
 export IREE_VULKAN_DISABLE=1
 export IREE_METAL_DISABLE=1
 export IREE_CUDA_DISABLE=1
diff --git a/build_tools/cmake/build_tracing.sh b/build_tools/cmake/build_tracing.sh
index 99b7829..2d39092 100755
--- a/build_tools/cmake/build_tracing.sh
+++ b/build_tools/cmake/build_tracing.sh
@@ -17,7 +17,7 @@
 source build_tools/cmake/setup_build.sh
 source build_tools/cmake/setup_ccache.sh
 
-# Note: https://github.com/openxla/iree/issues/6404 prevents us from building
+# Note: https://github.com/iree-org/iree/issues/6404 prevents us from building
 # tests with these other settings. Many tests invoke the compiler tools with
 # MLIR threading enabled, which crashes with compiler tracing enabled.
 "${CMAKE_BIN?}" -B "${BUILD_DIR}" \
diff --git a/build_tools/cmake/iree_copts.cmake b/build_tools/cmake/iree_copts.cmake
index e6e858d..46ba5a9 100644
--- a/build_tools/cmake/iree_copts.cmake
+++ b/build_tools/cmake/iree_copts.cmake
@@ -223,7 +223,7 @@
     "$<$<BOOL:${IREE_ENABLE_WERROR_FLAG}>:-Werror>"
     "-Wno-error=deprecated-declarations"  # Want to see them but defaults to error.
 
-    "-Wno-address"  # https://github.com/openxla/iree/issues/16016
+    "-Wno-address"  # https://github.com/iree-org/iree/issues/16016
     "-Wno-address-of-packed-member"
     "-Wno-comment"
     "-Wno-format-zero-length"
@@ -352,7 +352,7 @@
 # compatible solution.
 #
 # See also:
-#   https://github.com/openxla/iree/issues/4665.
+#   https://github.com/iree-org/iree/issues/4665.
 #   https://discourse.cmake.org/t/how-to-fix-build-warning-d9025-overriding-gr-with-gr/878
 #   https://gitlab.kitware.com/cmake/cmake/-/issues/20610
 if(CMAKE_CXX_FLAGS AND "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
@@ -503,7 +503,7 @@
         -Wno-unused-but-set-variable
     )
     set(_ADDL_INTERFACE_COPTS "${_RULE_SIZE_INTERFACE_COPTS}")
-    set(_ADDL_LINKOPTS 
+    set(_ADDL_LINKOPTS
       ${IREE_LTO_LINKOPTS}
       ${IREE_SIZE_OPTIMIZED_DEFAULT_LINKOPTS}
     )
diff --git a/build_tools/cmake/iree_python.cmake b/build_tools/cmake/iree_python.cmake
index 34875e6..39648a3 100644
--- a/build_tools/cmake/iree_python.cmake
+++ b/build_tools/cmake/iree_python.cmake
@@ -43,7 +43,7 @@
   foreach(_SRC_FILE ${_RULE_SRCS})
     # _SRC_FILE could have other path components in it, so we need to make a
     # directory for it. Ninja does this automatically, but make doesn't. See
-    # https://github.com/openxla/iree/issues/6801
+    # https://github.com/iree-org/iree/issues/6801
     set(_SRC_BIN_PATH "${CMAKE_CURRENT_BINARY_DIR}/${_SRC_FILE}")
     get_filename_component(_SRC_BIN_DIR "${_SRC_BIN_PATH}" DIRECTORY)
     add_custom_command(