[SPIRV] Additional fixes for const init via `UtoPtr` (#172584) #166494 added support for using `inttoptr` in global initialisation, and lowering int into `OpSpecConstantOp OpConvertUToPtr`. Unfortunately, it slightly more subtle case / exposed an existing issue around the `COPY` pseudo-op. This patch ensures that we glance through a `COPY` when figuring out whether an `OpConvertUToPtr` is actually operating on a global. We also correctly handle the case where a `G_PTR_ADD` is used by an `OpSpecConstantOp` in the context of global initialisation, which would otherwise lead to broken SPIR-V wherein the latter would reference a non constant Op. --------- Co-authored-by: Marcos Maronas <marcos.maronas@intel.com>
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