Rename files with same (case insensitive) name

[hiraditya]

Summary

This is causing issue with rebasing on mac because there is already a file DIModule.ll in the same directory.

https://reviews.llvm.org/D93462 added a new file dimodule.ll

[smeenai]

LGTM to unbreak the checkout. @cchen15 can choose a different name if they want later.

[cchen15]

Thanks for catching this for me. I don't work on Mac. :(

I don't see other tests using 'verify-' as prefix. Would it be more succinct to just call it dimodule-external-fortran.ll?

[hiraditya]

ok i'll rename this before commit.

[hiraditya]

rename

[cchen15]

Thanks a lot, Aditya. Again, my apologies for the screw-up. I will make sure I won't make the same mistake next time I add a new file.

[dyung]

This issue also affects Windows, so please commit this change.

[hiraditya]

It seems, I'm no longer having access to the llvm-project. Please commit this for me.

[hiraditya]

I need to setup access token because github has changed commit policy recently.