[clang] [CIR] Upstream handling for __builtin_prefetch (PR #164387)

[Andy Kaylor via cfe-commits]

================
@@ -1507,6 +1507,15 @@ static uint64_t getTypeSize(mlir::Type type, mlir::Operation &op) {
   return llvm::divideCeil(layout.getTypeSizeInBits(type), 8);
 }
 
+mlir::LogicalResult CIRToLLVMPrefetchOpLowering::matchAndRewrite(
+    cir::PrefetchOp op, OpAdaptor adaptor,
+    mlir::ConversionPatternRewriter &rewriter) const {
+  rewriter.replaceOpWithNewOp<mlir::LLVM::Prefetch>(
+      op, adaptor.getAddr(), adaptor.getIsWrite(), adaptor.getLocality(),
+      /*DataCache*/ 1);
----------------
andykaylor wrote:

```suggestion
      /*DataCache=*/1);
```

https://github.com/llvm/llvm-project/pull/164387