[llvm-branch-commits] [flang] [llvm] release/23.x: [flang][MIF] Update prif_coarray_handle in accordance with PRIF 0.8 #214080 (#214747) (PR #215004)

[Dan Bonachea via llvm-branch-commits]

https://github.com/bonachea approved this pull request.

LGTM! 

This PR backports the fix to #214080, a crucial correctness defect recently discovered in the new coarray support being introduced in the 23 release.

I tested it extensively in #214747 and verified it repairs the defect.

https://github.com/llvm/llvm-project/pull/215004