[flang-commits] [flang] [flang] Simplify the comparison of characters (PR #154593)

[Slava Zakharin via flang-commits]

https://github.com/vzakhari commented:

Thank you for the changes!

I think it is better to introduce an `hlfir.char_trim` operation and then recognize the same pattern using the new operation rather than recognizing the runtime calls.

FYI, @valerydmit is wroking on adding an HLFIR operation for scalar character comparison, so we won't have `_FortranACharacterCompareScalar1` soon.

https://github.com/llvm/llvm-project/pull/154593