[SPIRV] Use OpCopyMemory for logical SPIRV memcpy (#169348) This commit modifies the SPIRV instruction selector to emit `OpCopyMemory` instead of `OpCopyMemorySized` when generating SPIRV for logical addressing. Previously, `G_MEMCPY` was translated to `OpCopyMemorySized`, which requires an explicit size operand. However, for logical SPIRV, the size of the pointee type is implicitly known. This change ensures that `OpCopyMemory` is used, which is more appropriate for logical SPIRV and aligns with the SPIR-V specification for logical addressing.
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