[flang-commits] [flang] [flang][openmp]Add UserReductionDetails and use in DECLARE REDUCTION (PR #140066)

[Tom Eccles via flang-commits]

tblah wrote:

This is a continuation of @Leporacanthicus's work in https://github.com/llvm/llvm-project/pull/131628.

https://github.com/llvm/llvm-project/pull/140066