https://github.com/cjappl created 
https://github.com/llvm/llvm-project/pull/119904

This seems to pass tests and behaves as expected.

As suggested by @vitalybuka on #118989 

>From 8cfcf0461739e45716be1b3ed6700b5712b7801e Mon Sep 17 00:00:00 2001
From: Chris Apple <cja-priv...@pm.me>
Date: Thu, 12 Dec 2024 10:37:14 -0800
Subject: [PATCH] [rtsan][clang] NFC: Move rtsan init to addSanitizers

---
 clang/lib/CodeGen/BackendUtil.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/clang/lib/CodeGen/BackendUtil.cpp 
b/clang/lib/CodeGen/BackendUtil.cpp
index b3728c478772d3..2ef098172c01f5 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -738,6 +738,9 @@ static void addSanitizers(const Triple &TargetTriple,
     if (LangOpts.Sanitize.has(SanitizerKind::NumericalStability))
       MPM.addPass(NumericalStabilitySanitizerPass());
 
+    if (LangOpts.Sanitize.has(SanitizerKind::Realtime))
+      MPM.addPass(RealtimeSanitizerPass());
+
     auto ASanPass = [&](SanitizerMask Mask, bool CompileKernel) {
       if (LangOpts.Sanitize.has(Mask)) {
         bool UseGlobalGC = asanUseGlobalsGC(TargetTriple, CodeGenOpts);
@@ -1023,9 +1026,6 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
             FPM.addPass(BoundsCheckingPass());
           });
 
-    if (LangOpts.Sanitize.has(SanitizerKind::Realtime))
-      MPM.addPass(RealtimeSanitizerPass());
-
     // Don't add sanitizers if we are here from ThinLTO PostLink. That already
     // done on PreLink stage.
     if (!IsThinLTOPostLink) {

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