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

[David Sherwood via llvm-commits]

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@@ -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());
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david-arm wrote:

OK, that's true, but I just thought it must be easy enough to find out what the optimisation level is and just not bothering calling registerLateLoopOptimizationsEPCallback at all. I guess it's fine at the moment because we're only registering one pass.

https://github.com/llvm/llvm-project/pull/156802