[llvm][Inline] Add FunctionSimplificationPipeline to module inliner pipeline

The FunctionSimplificationPipeline could effectively reduce the size of .text section when module inliner is enabled.

Reviewed By: kazu

Differential Revision: https://reviews.llvm.org/D114704

Author: taoliq

llvm/include/llvm/Passes/PassBuilder.h

@@ -199,7 +199,7 @@ class PassBuilder {
 
   /// Construct the module pipeline that performs inlining with
   /// module inliner pass.
-  ModuleInlinerPass buildModuleInlinerPipeline(OptimizationLevel Level,
+  ModulePassManager buildModuleInlinerPipeline(OptimizationLevel Level,
                                                ThinOrFullLTOPhase Phase);
 
   /// Construct the core LLVM module optimization pipeline.

llvm/lib/Passes/PassBuilderPipelines.cpp

@@ -754,9 +754,11 @@ PassBuilder::buildInlinerPipeline(OptimizationLevel Level,
   return MIWP;
 }
 
-ModuleInlinerPass
+ModulePassManager
 PassBuilder::buildModuleInlinerPipeline(OptimizationLevel Level,
                                         ThinOrFullLTOPhase Phase) {
+  ModulePassManager MPM;
+
   InlineParams IP = getInlineParamsFromOptLevel(Level);
   if (Phase == ThinOrFullLTOPhase::ThinLTOPreLink && PGOOpt &&
       PGOOpt->Action == PGOOptions::SampleUse)
@@ -773,7 +775,16 @@ PassBuilder::buildModuleInlinerPipeline(OptimizationLevel Level,
   // inline deferral logic in module inliner.
   IP.EnableDeferral = false;
 
-  return ModuleInlinerPass(IP, UseInlineAdvisor);
+  MPM.addPass(ModuleInlinerPass(IP, UseInlineAdvisor));
+
+  MPM.addPass(createModuleToFunctionPassAdaptor(
+      buildFunctionSimplificationPipeline(Level, Phase),
+      PTO.EagerlyInvalidateAnalyses));
+
+  MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(
+      CoroSplitPass(Level != OptimizationLevel::O0)));
+
+  return MPM;
 }
 
 ModulePassManager