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

[David Green via llvm-commits]

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@@ -340,6 +342,7 @@ def : ProcessorModel<"sc300",       CortexM4Model,      [ARMv7m,
                                                          FeatureHasNoBranchPredictor]>;
 
 def : ProcessorModel<"cortex-m4", CortexM4Model,        [ARMv7em,
+                                                         ProcM4,
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davemgreen wrote:

Can we make this a subtarget feature, similar to FeatureHasSlowFPVMLx, so that we can use it on more cpus.

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