[PATCH] D63607: [clang][driver] Add basic --driver-mode=flang support for fortran

[Jeremy Morse via cfe-commits]

FYI, in llvmorg-10-init-8612-g6c0a160c2d3 [0] I've renamed one of the
two files, Windows too has a case-insensitive filesystem layer and
this broke our CI. (I think I've preserved the original intention of
the tests).

[0] https://github.com/llvm/llvm-project/commit/6c0a160c2d33e54aecf1538bf7c85d8da92051be

--
Thanks,
Jeremy