[llvm] [llvm][ARM] Add a cortex-m4f alignment hazard recognizer (PR #126991)

[Oliver Stannard via llvm-commits]

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@@ -622,6 +626,12 @@ void ARMPassConfig::addPreEmitPass2() {
     // Identify valid eh continuation targets for Windows EHCont Guard.
     addPass(createEHContGuardCatchretPass());
   }
+
+  // Enable the hazard recognizer for cortex-m4f at -O2 or higher.
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ostannard wrote:

Should we disable this at -Oz (and maybe -Os), or is that already handled by `ScheduleHazardRecognizer`?

https://github.com/llvm/llvm-project/pull/126991