[llvm] [SPIRV] Set hasSideEffects flag to false on type and constant opcodes (PR #164868)

[Steven Perron via llvm-commits]

s-perron wrote:

The concern with this change is the global registry. If we delete the type instruction, could we be left with a dangling pointer in the Global Registry that will be needed later?

https://github.com/llvm/llvm-project/pull/164868