[llvm] [ctx_prof] Insert the ctx prof flattener after the module inliner (PR #107499)

[David Li via llvm-commits]

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@@ -1017,6 +1017,11 @@ PassBuilder::buildModuleInlinerPipeline(OptimizationLevel Level,
   IP.EnableDeferral = false;
 
   MPM.addPass(ModuleInlinerPass(IP, UseInlineAdvisor, Phase));
+  if (!UseCtxProfile.empty()) {
+    MPM.addPass(GlobalOptPass());
+    MPM.addPass(GlobalDCEPass());
+    MPM.addPass(PGOCtxProfFlatteningPass());
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david-xl wrote:

should this be done only for postLink Phase?

https://github.com/llvm/llvm-project/pull/107499