[clang] [clang][Sema] Allow splat initialization of a sizeless vector in a C++ code (PR #205432)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/test/CodeGen/sizeless-splat-init-aarch64.cpp clang/test/CodeGen/sizeless-splat-init-riscv.cpp clang/lib/Sema/SemaExpr.cpp clang/lib/Sema/SemaInit.cpp clang/lib/Sema/SemaOverload.cpp clang/test/SemaCXX/sizeless-1.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/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 3d528a625..25886186a 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -8115,8 +8115,7 @@ static QualType getRawVectorElementType(ASTContext &Context,
 }
 
 ExprResult Sema::prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr) {
-  QualType DestElemTy =
-      getRawVectorElementType(Context, VectorTy);
+  QualType DestElemTy = getRawVectorElementType(Context, VectorTy);
 
   if (DestElemTy == SplattedExpr->getType())
     return SplattedExpr;

``````````

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https://github.com/llvm/llvm-project/pull/205432