[clang] [HLSL] add support for HLSLAggregateSplatCast and HLSLElementwiseCast to constant expression evaluator (PR #164700)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/AST/ExprConstant.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/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index a961e4869..f093737a1 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -11243,8 +11243,7 @@ bool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) {
     // flatten the source
     SmallVector<APValue> SrcEls;
     SmallVector<QualType> SrcTypes;
-    if (!flattenAPValue(Info.Ctx, Val, SE->getType(), SrcEls, SrcTypes,
-                        NEls))
+    if (!flattenAPValue(Info.Ctx, Val, SE->getType(), SrcEls, SrcTypes, NEls))
       return Error(E);
 
     // cast the elements and construct our struct result
@@ -13796,8 +13795,7 @@ bool ArrayExprEvaluator::VisitCastExpr(const CastExpr *E) {
     // flatten the source
     SmallVector<APValue> SrcEls;
     SmallVector<QualType> SrcTypes;
-    if (!flattenAPValue(Info.Ctx, Val, SE->getType(), SrcEls, SrcTypes,
-                        NEls))
+    if (!flattenAPValue(Info.Ctx, Val, SE->getType(), SrcEls, SrcTypes, NEls))
       return Error(E);
 
     // cast the elements

``````````

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https://github.com/llvm/llvm-project/pull/164700