Merge "Enable MLGO for register allocation" into main

cc/config/global.go

@@ -140,6 +140,9 @@ var (
 		"-Werror=format-security",
 		"-nostdlibinc",
 
+		// Enable MLGO for register allocation.
+		"-mllvm -regalloc-enable-advisor=release",
+
 		// Emit additional debug info for AutoFDO
 		"-fdebug-info-for-profiling",
 	}
@@ -167,6 +170,8 @@ var (
 		"-Wl,--exclude-libs,libgcc_stripped.a",
 		"-Wl,--exclude-libs,libunwind_llvm.a",
 		"-Wl,--exclude-libs,libunwind.a",
+		// Enable MLGO for register allocation.
+		"-Wl,-mllvm,-regalloc-enable-advisor=release",
 	}
 
 	deviceGlobalLldflags = append(deviceGlobalLdflags, commonGlobalLldflags...)