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

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

I believe the current plan for SPIR-V is to switch away from using plain GEP because of the underlying issues; see #190157.

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