[clang] Reapply "[Clang][CMake] Use IRPGO instead of FE PGO for Cmake Caches" (PR #160711)

[Aiden Grossman via cfe-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/160711

This reverts commit 18f7e03dd60d84b5da3403f10177323df01b6f92.

Reapplies #160133.

This was reverted originally because it was causing compilation crashes in ControlHeightReduction. It was reverted again because fix in CntrolHeightReduction was causing more problems. Everything should be in working order now, so relanding.

>From adb4a1fdd866c92872c4adefa7b0075f9e7100a1 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Thu, 25 Sep 2025 14:13:56 +0000
Subject: [PATCH] Reapply "[Clang][CMake] Use IRPGO instead of FE PGO for Cmake
 Caches"

This reverts commit 18f7e03dd60d84b5da3403f10177323df01b6f92.

Reapplies #160133.

This was reverted originally because it was causing compilation crashes
in ControlHeightReduction. It was reverted again because fix in
CntrolHeightReduction was causing more problems. Everything should be in
working order now, so relanding.
---
 clang/cmake/caches/PGO.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/cmake/caches/PGO.cmake b/clang/cmake/caches/PGO.cmake
index 15bc755d110d1..d6471160037c1 100644
--- a/clang/cmake/caches/PGO.cmake
+++ b/clang/cmake/caches/PGO.cmake
@@ -5,7 +5,7 @@ set(LLVM_ENABLE_PROJECTS "clang;lld" CACHE STRING "")
 set(LLVM_ENABLE_RUNTIMES "compiler-rt;libcxx;libcxxabi;libunwind" CACHE STRING "")
 
 set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "")
-set(BOOTSTRAP_LLVM_BUILD_INSTRUMENTED ON CACHE BOOL "")
+set(BOOTSTRAP_LLVM_BUILD_INSTRUMENTED IR CACHE BOOL "")
 set(CLANG_BOOTSTRAP_TARGETS
   generate-profdata
   stage2