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

[Nathan Gauër via llvm-commits]

https://github.com/Keenuts commented:

LGTM, but yes the GlobalRegistry keeping references might be an issue.
IIRC there was some work to make this an analysis or something like this no? @michalpaszkowski 

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