[SPIRV] Handle aggregate arguments to `spv_store` (#172348) This patch handles the special case where an extract value yields an aggregate result, which then is used as an argument to a store. The SPIRV BE uses special intrinsics (`spv_extractv` and `spv_store`) to represent these through IRTranslator, however this creates a problem: `spv_store` is called as a function, and IRTranslator cannot handle arguments that take more than a vreg. For other functions, the aggregate argument replacement pass would have solved things, but it does not apply here. Hence, we apply the same mutate-into-Int32 solution here when dealing with stores, and restore the extract value's type (which we have available as a ValueAttr) during instruction selection.
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