[Pass Builder] Allow Module Inliner for full lto

[IBricchi]

Summary

Currently there is no way to enable the module inliner
when linking with -flto=full. This patch enables that
option.

llvm/lib/Passes/PassBuilderPipelines.cpp

PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level,
   MPM.addPass(createModuleToFunctionPassAdaptor(std::move(PeepholeFPM),
                                                 PTO.EagerlyInvalidateAnalyses));
 
   // Note: historically, the PruneEH pass was run first to deduce nounwind and
   // generally clean up exception handling overhead. It isn't clear this is
   // valuable as the inliner doesn't currently care whether it is inlining an
   // invoke or a call.
   // Run the inliner now.
-  MPM.addPass(ModuleInlinerWrapperPass(
-      getInlineParamsFromOptLevel(Level),
-      /* MandatoryFirst */ true,
-      InlineContext{ThinOrFullLTOPhase::FullLTOPostLink,
-                    InlinePass::CGSCCInliner}));
+  if (EnableModuleInliner){
+    MPM.addPass(buildModuleInlinerPipeline(Level, ThinOrFullLTOPhase::FullLTOPostLink));
+  }
+  else{
+    MPM.addPass(buildInlinerPipeline(Level, ThinOrFullLTOPhase::FullLTOPostLink));
+  }
 
   // Perform context disambiguation after inlining, since that would reduce the
   // amount of additional cloning required to distinguish the allocation
   // contexts.
   if (EnableMemProfContextDisambiguation)
     MPM.addPass(MemProfContextDisambiguation());
 
   // Optimize globals again after we ran the inliner.