[clang] [llvm] [ABI] Add CanBeFlattened to ArgInfo for Direct struct coerces (PR #220579)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/unittests/ABI/FunctionInfoTest.cpp clang/lib/CIR/Dialect/Transforms/CallConvLoweringPass.cpp llvm/include/llvm/ABI/FunctionInfo.h --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/CallConvLoweringPass.cpp b/clang/lib/CIR/Dialect/Transforms/CallConvLoweringPass.cpp
index 299adf5fd..4302b38e3 100644
--- a/clang/lib/CIR/Dialect/Transforms/CallConvLoweringPass.cpp
+++ b/clang/lib/CIR/Dialect/Transforms/CallConvLoweringPass.cpp
@@ -578,7 +578,8 @@ convertABIArgInfo(const llvm::abi::ArgInfo &info, MLIRContext *ctx,
     // trip for nothing.
     if (comparesAgainstCoerce && coerced == origTy)
       return ArgClassification::getDirect();
-    ArgClassification classified = ArgClassification::getDirect(coerced, offset);
+    ArgClassification classified =
+        ArgClassification::getDirect(coerced, offset);
     classified.canFlatten = info.getCanBeFlattened();
     return classified;
   }

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https://github.com/llvm/llvm-project/pull/220579