[llvm] [ARM][AArch64] Enable FEAT_FHM, disable FEAT_MEC for Arm Neoverse N2 (PR #82613)

[Eli Friedman via llvm-commits]

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@@ -684,7 +684,7 @@ def HasV8_9aOps : SubtargetFeature<
 
 def HasV9_0aOps : SubtargetFeature<
   "v9a", "HasV9_0aOps", "true", "Support ARM v9a instructions",
-  [HasV8_5aOps, FeatureMEC, FeatureSVE2]>;
+  [HasV8_5aOps, FeatureSVE2]>;
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efriedma-quic wrote:

This looks like it affects every CPU that declares support for armv9; is this correct for all of them?

https://github.com/llvm/llvm-project/pull/82613