[clang] [clang][perf-training] Fix profiling with -DCLANG_BOLT=perf (PR #119117)

[Tom Stellard via cfe-commits]

================
@@ -20,9 +21,13 @@ elif clang_bolt_mode == "perf":
 else:
     assert 0, "Unsupported CLANG_BOLT_MODE variable"
 
-config.clang = perf_wrapper + os.path.realpath(
+clang_nowrapper = os.path.realpath(
     lit.util.which(clang_binary, config.clang_tools_dir)
 ).replace("\\", "/")
+config.clang = perf_wrapper + clang_nowrapper
+config.cmake_compiler_args = "-DCMAKE_C_COMPILER='{0}' -DCMAKE_CXX_COMPILER='{0};--driver-mode=g++'".format(
+    re.sub(r"\s+", ";", clang_nowrapper)
+)
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tstellar wrote:

@aaupov Here we are using clang_nowrapper as the compiler, so we don't end up with nested perf calls.

https://github.com/llvm/llvm-project/pull/119117