[llvm] [IR] Implementation and lowering of bitinsert and bitextract (PR #200605)

[Antonio Frighetto via llvm-commits]

https://github.com/antoniofrighetto commented:

> Missing bitcode compatibility test

I think this is still unaddressed (the instructions should be part of Bitcode/compatibility.ll test).

https://github.com/llvm/llvm-project/pull/200605