[llvm] [X86][CodeGen] Support folding memory broadcast in X86InstrInfo::foldMemoryOperandImpl (PR #79761)

[Simon Pilgrim via llvm-commits]

================
@@ -8377,7 +8523,7 @@ bool X86InstrInfo::unfoldMemoryOperand(
     // memory access is slow above.
 
     unsigned Opc;
-    if (FoldedBCast) {
+    if (BCastType) {
----------------
RKSimon wrote:

Won't this fail on TB_BCAST_W?
```c
TB_BCAST_W = 0 << TB_BCAST_TYPE_SHIFT
```

https://github.com/llvm/llvm-project/pull/79761