[HLSL] Update vector swizzle elements individually (#169090) When individual elements of a vector are updated via vector swizzle, it needs to be handled as separate store operations to the individual vector elements. Clang treats vectors as one unit, so if a part of a vector needs to be updated, the whole vector is loaded, some elements modified, and then the whole vector is stored. In HLSL vector elements are handled separately. We need to avoid this load/modify/store sequence to prevent overwriting other vector elements that might be getting updated in parallel. Fixes #152815
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