[llvm] [InstCombine] Skip GEP canonicalization for types containing target extension types (PR #191790)

[Maosu Zhao via llvm-commits]

zhaomaosu wrote:

Yeah, there are some target extension types have layout info and allow to be sized. This may because they hope to take some optimizations. But for other types doesn't allow to be sized, I think we should follow the LangRef's requirement to preserve it through optimization.

https://github.com/llvm/llvm-project/pull/191790