[llvm] [X86][MemFold] Allow masked load folding if masks are equal (PR #161074)

[Simon Pilgrim via llvm-commits]

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@@ -8113,6 +8113,38 @@ MachineInstr *X86InstrInfo::foldMemoryOperandImpl(
     MachineBasicBlock::iterator InsertPt, MachineInstr &LoadMI,
     LiveIntervals *LIS) const {
 
+  Register MaskReg;
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RKSimon wrote:

Please add a suitable summary comment.

https://github.com/llvm/llvm-project/pull/161074