[llvm] Reapply "[CodeGen][AArch64] Avoid duplicate hints in register allocation (#219007)" (#224451) (PR #224742)

[Nick Desaulniers via llvm-commits]

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@@ -1260,8 +1260,7 @@ bool AArch64RegisterInfo::getRegAllocationHints(
     return ConsiderOnlyHints;
 
   if (!ST.hasSME() || !ST.isStreaming())
-    return TargetRegisterInfo::getRegAllocationHints(VirtReg, Order, Hints, MF,
-                                                     VRM);
+    return ConsiderOnlyHints;
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nickdesaulniers wrote:

At that point, I might as well just skip ahead to the interface rewrite (WIP: https://github.com/llvm/llvm-project/pull/224472/changes/5bc5d83984e82cbecac5c88fe0b3708a21cd7133) since changes to llvm/lib/CodeGen/TargetRegisterInfo.cpp in this PR are about to get replaced imminently by that PR.

And I wouldn't consider such a change as NFC.

https://github.com/llvm/llvm-project/pull/224742