[clang] [CIR] Upstream handling for member ptr function compare (PR #176029)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/test/CIR/CodeGen/pointer-to-member-func-cmp.cpp clang/lib/CIR/Dialect/Transforms/CXXABILowering.cpp clang/lib/CIR/Dialect/Transforms/TargetLowering/CIRCXXABI.h clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerItaniumCXXABI.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerItaniumCXXABI.cpp b/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerItaniumCXXABI.cpp
index a4ada38bc..39fcbcdf4 100644
--- a/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerItaniumCXXABI.cpp
+++ b/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerItaniumCXXABI.cpp
@@ -263,8 +263,8 @@ mlir::Value LowerItaniumCXXABI::lowerMethodCmp(cir::CmpOp op,
 
   mlir::ImplicitLocOpBuilder locBuilder(op.getLoc(), builder);
   cir::IntType ptrdiffCIRTy = getPtrDiffCIRTy(lm);
-  mlir::Value ptrdiffZero = cir::ConstantOp::create(
-      locBuilder, cir::IntAttr::get(ptrdiffCIRTy, 0));
+  mlir::Value ptrdiffZero =
+      cir::ConstantOp::create(locBuilder, cir::IntAttr::get(ptrdiffCIRTy, 0));
 
   mlir::Value lhsPtrField =
       cir::ExtractMemberOp::create(locBuilder, ptrdiffCIRTy, loweredLhs, 0);

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https://github.com/llvm/llvm-project/pull/176029