[clang] [CIR] Add support for __builtin_assume_aligned (PR #152152)

[Andy Kaylor via cfe-commits]

================
@@ -460,6 +460,28 @@ mlir::LogicalResult CIRToLLVMAssumeOpLowering::matchAndRewrite(
   return mlir::success();
 }
 
+mlir::LogicalResult CIRToLLVMAssumeAlignedOpLowering::matchAndRewrite(
+    cir::AssumeAlignedOp op, OpAdaptor adaptor,
+    mlir::ConversionPatternRewriter &rewriter) const {
+  SmallVector<mlir::Value, 3> opBundleArgs{adaptor.getPointer()};
+
+  auto alignment = mlir::LLVM::ConstantOp::create(
+      rewriter, op.getLoc(), rewriter.getI64Type(), adaptor.getAlignment());
----------------
andykaylor wrote:

```suggestion
      rewriter, op.getLoc(), adaptor.getAlignmentAttr());
```

https://github.com/llvm/llvm-project/pull/152152