[clang] [CIR] Upstream proper function alias lowering (PR #150520)

[Henrich Lauko via cfe-commits]

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@@ -1166,6 +1199,31 @@ void CIRToLLVMFuncOpLowering::lowerFuncAttributes(
   }
 }
 
+mlir::LogicalResult CIRToLLVMFuncOpLowering::matchAndRewriteAlias(
+    cir::FuncOp op, mlir::FlatSymbolRefAttr aliasee, mlir::Type ty,
+    OpAdaptor adaptor, mlir::ConversionPatternRewriter &rewriter) const {
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xlauko wrote:

```suggestion
    mlir::OpAdaptor adaptor, mlir::ConversionPatternRewriter &rewriter) const {
```

https://github.com/llvm/llvm-project/pull/150520