[HLSL][Matrix] EmitFromMemory when emitting load of vector and matrix element LValues (#178315) Fixes #177712 The MatrixElt and VectorElt cases of `EmitLoadOfLValue` did not convert the scalar value from its load/store type into its primary IR type like the other cases do, which caused issues with HLSL in particular which requires bools to be converted to and from i32 and i1 forms for its load/store and primary IR types respectively. This PR fixes the issue by applying `EmitFromMemory` to the loaded scalar.
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