[flang-commits] [flang] [flang]Add new intrinsic function backtrace and complete the TODO of abort (PR #117603)

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dty2 wrote:

@kparzysz  Thank you for your patience in guiding my code. Please review the latest changes again to see if they meet the merge criteria. I will try my best to implement the -fno-backtrace option. If the implementation is successful, I will submit another PR. And I will continue to do my part for the llvm and flang communities.

https://github.com/llvm/llvm-project/pull/117603