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

[David Green via llvm-commits]

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@@ -1445,6 +1446,9 @@ void ARMAsmPrinter::emitInstruction(const MachineInstr *MI) {
     InConstantPool = false;
   }
 
+  if (MI->getAsmPrinterFlag(MachineInstr::CommentFlag(ARM::ALIGNMENT_HAZARD)))
+    OutStreamer->AddComment("alignment hazard");
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davemgreen wrote:

Can you explain what this is useful for? We would not usually add such comments for other alignment changes like aligning loops or functions.

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