[llvm] [DebugInfo] Allow DISubrange/DIGenericSubrange without count/upperBound. (PR #96474)

[Abid Qadeer via llvm-commits]

abidh wrote:

I am going to modify test to have `; REQUIRES: x86_64-linux` as other related fortran tests do.

https://github.com/llvm/llvm-project/pull/96474