Add `-iree-llvm-loop-unrolling` flag to CPU MobilberNet V2 targets (#5656)

build_tools/mako/configuration.py

diff --git a/build_tools/mako/configuration.py b/build_tools/mako/configuration.py
index 15d7cd3..dcf6c20 100644
--- a/build_tools/mako/configuration.py
+++ b/build_tools/mako/configuration.py
@@ -236,10 +236,12 @@
                     skipped_target=["vlk2"],
                     compilation_flags={
                         'cpu': [
-                            "--iree-flow-dispatch-formation-enable-operand-fusion"
+                            "--iree-flow-dispatch-formation-enable-operand-fusion",
+                            "-iree-llvm-loop-unrolling=true"
                         ],
                         'cpu3t': [
-                            "--iree-flow-dispatch-formation-enable-operand-fusion"
+                            "--iree-flow-dispatch-formation-enable-operand-fusion",
+                            "-iree-llvm-loop-unrolling=true"
                         ]
                     })),
             PhoneBenchmarkInfo(
@@ -248,10 +250,12 @@
                 targets=get_s20_default_target_list(
                     compilation_flags={
                         'cpu': [
-                            "--iree-flow-dispatch-formation-enable-operand-fusion"
+                            "--iree-flow-dispatch-formation-enable-operand-fusion",
+                            "-iree-llvm-loop-unrolling=true"
                         ],
                         'cpu3t': [
-                            "--iree-flow-dispatch-formation-enable-operand-fusion"
+                            "--iree-flow-dispatch-formation-enable-operand-fusion",
+                            "-iree-llvm-loop-unrolling=true"
                         ]
                     })),
         ]),