Create SampleProfileLoader pass in llvm instead of clang

Summary: We used to create SampleProfileLoader pass in clang. This makes LTO/ThinLTO unable to add this pass in the linker plugin. This patch moves the SampleProfileLoader pass creation from clang to llvm pass manager builder.

Reviewers: tejohnson, davidxl, dnovillo

Subscribers: llvm-commits, mehdi_amini

Differential Revision: https://reviews.llvm.org/D27743

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289714 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/IPO/PassManagerBuilder.h

@@ -149,6 +149,8 @@ class PassManagerBuilder {
   std::string PGOInstrGen;
   /// Path of the profile data file.
   std::string PGOInstrUse;
+  /// Path of the sample Profile data file.
+  std::string PGOSampleUse;
 
 private:
   /// ExtensionList - This is list of all of the extensions that are registered.

lib/Transforms/IPO/PassManagerBuilder.cpp

@@ -383,6 +383,11 @@ void PassManagerBuilder::addFunctionSimplificationPasses(
 
 void PassManagerBuilder::populateModulePassManager(
     legacy::PassManagerBase &MPM) {
+  if (!PGOSampleUse.empty()) {
+    MPM.add(createPruneEHPass());
+    MPM.add(createSampleProfileLoaderPass(PGOSampleUse));
+  }
+
   // Allow forcing function attributes as a debugging and tuning aid.
   MPM.add(createForceFunctionAttrsLegacyPass());