[llvm] X86: Stop using MachineFunction in getPointerRegClass (PR #156880)

[Reid Kleckner via llvm-commits]

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@@ -230,6 +230,12 @@ let RecomputePerFunction = 1 in {
                                         "!Subtarget->hasSSE41()">;
   def ImportCallOptimizationEnabled : Predicate<"MF->getFunction().getParent()->getModuleFlag(\"import-call-optimization\")">;
   def ImportCallOptimizationDisabled : Predicate<"!MF->getFunction().getParent()->getModuleFlag(\"import-call-optimization\")">;
+
+  def IsWin64CCFunc : Predicate<"MF->getFunction().getCallingConv() == CallingConv::Win64">;
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rnk wrote:

Is this correct when targeting Windows OS? I'm pretty sure in that context, we use the win64 convention, but we model it as the platform C calling convention. Maybe that doesn't matter for the purpose you're using the predicate for, but the predicate may be misleading to the reader.

https://github.com/llvm/llvm-project/pull/156880