Fix up type mismatches by adding OpCopyLogical when necessary.

[s-perron]

When generating SPIR-V code, the same llvm type could be lowered into two different SPIR-V types.

This can cause type mismatches on some instruction that need to be fixed up. One example that has already been fixed is a load from a memory location in the storage buffer address space (or any other address space that requires an explicit layout).

We will need to fix up other memory operations in the same way.