[Matrix][HLSL] Revert Constant Matrix single subscript handling (#172887) This change creates an XFAIL that will be addressed by #172805 This part of the change was not intended to make it in. It was a way to optimize for constant index setters\getters but had the unintended consequence of doing swizzles without considering the encoded element offsets. We need to be calling `MakeExtVectorElt` in `EmitExtVectorElementExpr` so that we can call `E->getEncodedElementAccess(Elts);` off of the `ExtVectorElementExpr` Node. Calling it in `EmitMatrixSingleSubscriptExpr` was wrong because we doing have the vector encoded elementts yet. But also to get the right index we need a way to pass on the matrix column and row lengths so `MakeMatrixRow` needed to be expanded to store row and column sizes on the LValue.
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