[AArch64] Don't run loop-idiom-vectorize pass in the O0 pipeline (#156802)

As noted in #156787

Author: MaskRay

llvm/lib/Target/AArch64/AArch64TargetMachine.cpp

@@ -589,7 +589,8 @@ void AArch64TargetMachine::registerPassBuilderCallbacks(PassBuilder &PB) {
 
  PB.registerLateLoopOptimizationsEPCallback(
  [=](LoopPassManager &LPM, OptimizationLevel Level) {
- LPM.addPass(LoopIdiomVectorizePass());
+ if (Level != OptimizationLevel::O0)
+ LPM.addPass(LoopIdiomVectorizePass());
  });
  if (getTargetTriple().isOSWindows())
  PB.registerPipelineEarlySimplificationEPCallback(

llvm/lib/Target/AArch64/CMakeLists.txt

@@ -108,6 +108,7 @@ add_llvm_target(AArch64CodeGen
  Core
  GlobalISel
  MC
+ Passes
  Scalar
  SelectionDAG
  Support

llvm/test/CodeGen/AArch64/print-pipeline-passes.ll

@@ -0,0 +1,10 @@
+; RUN: opt -mtriple=aarch64 -S -passes='default<O0>' -print-pipeline-passes < %s | FileCheck --check-prefix=O0 %s
+; RUN: opt -mtriple=aarch64 -S -passes='default<O2>' -print-pipeline-passes < %s | FileCheck %s
+
+; CHECK: loop-idiom-vectorize
+; O0: {{^}}function(ee-instrument<>),always-inline,coro-cond(coro-early,cgscc(coro-split),coro-cleanup,globaldce),function(annotation-remarks),verify,print{{$}}
+
+define void @foo() {
+entry:
+ ret void
+}