[llvm] [Clang][InstCombine] Recognise div/ldiv/lldiv libcalls (PR #215868)

[Magnus Strømme via llvm-commits]

Magnushst wrote:

> This shouldn't mix the clang changes (which I also don't understand) and llvm pieces

Agreed. I’ve removed both the name special-casing and the Clang regression test. The PR is now limited to the TargetLibraryInfo/InstCombine implementation and LLVM tests

https://github.com/llvm/llvm-project/pull/215868