[clang] [X86_64] fix empty structure vaarg in c++ (PR #77903)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 4d467215f162b487381e17b8cb59283af75ca50e ebb2cdbea5e2c29b52f3bd46d31af105cf395e6d -- clang/test/CodeGen/X86/x86_64-vaarg.c clang/lib/CodeGen/Targets/X86.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/Targets/X86.cpp b/clang/lib/CodeGen/Targets/X86.cpp
index fde76ed670..4f9e903b8f 100644
--- a/clang/lib/CodeGen/Targets/X86.cpp
+++ b/clang/lib/CodeGen/Targets/X86.cpp
@@ -2989,11 +2989,11 @@ static Address EmitX86_64VAArgFromMemory(CodeGenFunction &CGF,
   // an 8 byte boundary.
 
   uint64_t SizeInBytes = (CGF.getContext().getTypeSize(Ty) + 7) / 8;
-  
+
   if (isEmptyRecord(CGF.getContext(), Ty, true)) {
-    SizeInBytes = 0;  
+    SizeInBytes = 0;
   }
-  
+
   llvm::Value *Offset =
       llvm::ConstantInt::get(CGF.Int32Ty, (SizeInBytes + 7)  & ~7);
   overflow_arg_area = CGF.Builder.CreateGEP(CGF.Int8Ty, overflow_arg_area,

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https://github.com/llvm/llvm-project/pull/77903