[clang] [HLSL][Matrix] Add support for ICK_HLSL_Matrix_Splat to add splat cast of scalars (PR #170885)

[Farzon Lotfi via cfe-commits]

================
@@ -7806,6 +7806,29 @@ ExprResult Sema::prepareVectorSplat(QualType VectorTy, 
Expr *SplattedExpr) {
   return ImpCastExprToType(SplattedExpr, DestElemTy, CK);
 }
 
+ExprResult Sema::prepareMatrixSplat(QualType MatrixTy, Expr *SplattedExpr) {
+  QualType DestElemTy = MatrixTy->castAs<MatrixType>()->getElementType();
+
+  if (DestElemTy == SplattedExpr->getType())
+    return SplattedExpr;
+
+  assert(DestElemTy->isFloatingType() ||
+         DestElemTy->isIntegralOrEnumerationType());
+
+  CastKind CK;
+  // TODO: Add support for boolean matrix once exposed
+  // https://github.com/llvm/llvm-project/issues/170920
----------------
farzonl wrote:

will need to come back and address this when doing 
https://github.com/llvm/llvm-project/issues/170920

https://github.com/llvm/llvm-project/pull/170885
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