[NewPassManager] Run global dead code elimination after the inliner.

This is the same exact change we did for the current pass manager
in rL314997, but the new pass manager pipeline already happened
to run GlobalOpt after the inliner, so we just insert a run of
GDCE here.

llvm-svn: 315003

llvm/lib/Passes/PassBuilder.cpp

@@ -670,6 +670,7 @@ PassBuilder::buildModuleOptimizationPipeline(OptimizationLevel Level,
 
   // Optimize globals now that the module is fully simplified.
   MPM.addPass(GlobalOptPass());
+  MPM.addPass(GlobalDCEPass());
 
   // Run partial inlining pass to partially inline functions that have
   // large bodies.

llvm/test/Other/new-pm-defaults.ll

@@ -179,6 +179,7 @@
 ; CHECK-O-NEXT: Running pass: PassManager<{{.*}}Module{{.*}}>
 ; CHECK-O-NEXT: Starting llvm::Module pass manager run.
 ; CHECK-O-NEXT: Running pass: GlobalOptPass
+; CHECK-O-NEXT: Running pass: GlobalDCEPass
 ; CHECK-O-NEXT: Running pass: EliminateAvailableExternallyPass
 ; CHECK-O-NEXT: Running pass: ReversePostOrderFunctionAttrsPass
 ; CHECK-O-NEXT: Running pass: RequireAnalysisPass<{{.*}}GlobalsAA

llvm/test/Other/new-pm-thinlto-defaults.ll

@@ -168,6 +168,7 @@
 ; CHECK-POSTLINK-O-NEXT: Running pass: PassManager<{{.*}}Module{{.*}}>
 ; CHECK-POSTLINK-O-NEXT: Starting llvm::Module pass manager run.
 ; CHECK-POSTLINK-O-NEXT: Running pass: GlobalOptPass
+; CHECK-POSTLINK-O-NEXT: Running pass: GlobalDCEPass
 ; CHECK-POSTLINK-O-NEXT: Running pass: EliminateAvailableExternallyPass
 ; CHECK-POSTLINK-O-NEXT: Running pass: ReversePostOrderFunctionAttrsPass
 ; CHECK-POSTLINK-O-NEXT: Running pass: RequireAnalysisPass<{{.*}}GlobalsAA