[LegacyPM] Remove ThinLTO/LTO pipelines

Using the legacy PM for the optimization pipeline was deprecated in 13.0.0.
Following recent changes to remove non-core features of the legacy
PM/optimization pipeline, remove the (Thin)LTO pipelines.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D123882

Author: aeubanks

llvm/include/llvm-c/Transforms/PassManagerBuilder.h

@@ -72,12 +72,6 @@ void
 LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB,
                                                 LLVMPassManagerRef PM);
 
-/** See llvm::PassManagerBuilder::populateLTOPassManager. */
-void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB,
-                                                  LLVMPassManagerRef PM,
-                                                  LLVMBool Internalize,
-                                                  LLVMBool RunInliner);
-
 /**
  * @}
  */

llvm/include/llvm/Transforms/IPO/PassManagerBuilder.h

@@ -224,8 +224,6 @@ class PassManagerBuilder {
 
   /// populateModulePassManager - This sets up the primary pass manager.
   void populateModulePassManager(legacy::PassManagerBase &MPM);
-  void populateLTOPassManager(legacy::PassManagerBase &PM);
-  void populateThinLTOPassManager(legacy::PassManagerBase &PM);
 };
 
 /// Registers a function for adding a standard set of passes.  This should be

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

@@ -1092,80 +1092,6 @@ void PassManagerBuilder::addLateLTOOptimizationPasses(
     PM.add(createMergeFunctionsPass());
 }
 
-void PassManagerBuilder::populateThinLTOPassManager(
-    legacy::PassManagerBase &PM) {
-  PerformThinLTO = true;
-  if (LibraryInfo)
-    PM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo));
-
-  if (VerifyInput)
-    PM.add(createVerifierPass());
-
-  if (ImportSummary) {
-    // This pass imports type identifier resolutions for whole-program
-    // devirtualization and CFI. It must run early because other passes may
-    // disturb the specific instruction patterns that these passes look for,
-    // creating dependencies on resolutions that may not appear in the summary.
-    //
-    // For example, GVN may transform the pattern assume(type.test) appearing in
-    // two basic blocks into assume(phi(type.test, type.test)), which would
-    // transform a dependency on a WPD resolution into a dependency on a type
-    // identifier resolution for CFI.
-    //
-    // Also, WPD has access to more precise information than ICP and can
-    // devirtualize more effectively, so it should operate on the IR first.
-    PM.add(createWholeProgramDevirtPass(nullptr, ImportSummary));
-    PM.add(createLowerTypeTestsPass(nullptr, ImportSummary));
-  }
-
-  populateModulePassManager(PM);
-
-  if (VerifyOutput)
-    PM.add(createVerifierPass());
-  PerformThinLTO = false;
-}
-
-void PassManagerBuilder::populateLTOPassManager(legacy::PassManagerBase &PM) {
-  if (LibraryInfo)
-    PM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo));
-
-  if (VerifyInput)
-    PM.add(createVerifierPass());
-
-  addExtensionsToPM(EP_FullLinkTimeOptimizationEarly, PM);
-
-  if (OptLevel != 0)
-    addLTOOptimizationPasses(PM);
-  else {
-    // The whole-program-devirt pass needs to run at -O0 because only it knows
-    // about the llvm.type.checked.load intrinsic: it needs to both lower the
-    // intrinsic itself and handle it in the summary.
-    PM.add(createWholeProgramDevirtPass(ExportSummary, nullptr));
-  }
-
-  // Create a function that performs CFI checks for cross-DSO calls with targets
-  // in the current module.
-  PM.add(createCrossDSOCFIPass());
-
-  // Lower type metadata and the type.test intrinsic. This pass supports Clang's
-  // control flow integrity mechanisms (-fsanitize=cfi*) and needs to run at
-  // link time if CFI is enabled. The pass does nothing if CFI is disabled.
-  PM.add(createLowerTypeTestsPass(ExportSummary, nullptr));
-  // Run a second time to clean up any type tests left behind by WPD for use
-  // in ICP (which is performed earlier than this in the regular LTO pipeline).
-  PM.add(createLowerTypeTestsPass(nullptr, nullptr, true));
-
-  if (OptLevel != 0)
-    addLateLTOOptimizationPasses(PM);
-
-  addExtensionsToPM(EP_FullLinkTimeOptimizationLast, PM);
-
-  PM.add(createAnnotationRemarksLegacyPass());
-
-  if (VerifyOutput)
-    PM.add(createVerifierPass());
-}
-
 LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate() {
   PassManagerBuilder *PMB = new PassManagerBuilder();
   return wrap(PMB);
@@ -1231,18 +1157,3 @@ LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB,
   legacy::PassManagerBase *MPM = unwrap(PM);
   Builder->populateModulePassManager(*MPM);
 }
-
-void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB,
-                                                  LLVMPassManagerRef PM,
-                                                  LLVMBool Internalize,
-                                                  LLVMBool RunInliner) {
-  PassManagerBuilder *Builder = unwrap(PMB);
-  legacy::PassManagerBase *LPM = unwrap(PM);
-
-  // A small backwards compatibility hack. populateLTOPassManager used to take
-  // an RunInliner option.
-  if (RunInliner && !Builder->Inliner)
-    Builder->Inliner = createFunctionInliningPass();
-
-  Builder->populateLTOPassManager(*LPM);
-}

llvm/tools/bugpoint/bugpoint.cpp

@@ -67,10 +67,6 @@ static cl::opt<bool>
 static cl::list<const PassInfo *, bool, PassNameParser>
     PassList(cl::desc("Passes available:"), cl::ZeroOrMore);
 
-static cl::opt<bool>
-    StandardLinkOpts("std-link-opts",
-                     cl::desc("Include the standard link time optimizations"));
-
 static cl::opt<bool>
     OptLevelO1("O1", cl::desc("Optimization level 1. Identical to 'opt -O1'"));
 
@@ -203,12 +199,6 @@ int main(int argc, char **argv) {
 
   AddToDriver PM(D);
 
-  if (StandardLinkOpts) {
-    PassManagerBuilder Builder;
-    Builder.Inliner = createFunctionInliningPass();
-    Builder.populateLTOPassManager(PM);
-  }
-
   if (OptLevelO1)
     AddOptimizationPasses(PM, 1, 0);
   else if (OptLevelO2)