[lld] [llvm] Rename `F_no_mmap` to `F_mmap` (PR #134787)

[via llvm-commits]

dgg5503 wrote:

Hi @chestnykh ,

We noticed that these changes have caused the LIT test `lld\test\ELF\link-open-file.test` to fail under our upstream Windows Build Bot here: https://lab.llvm.org/buildbot/#/builders/46/builds/14847

I've confirmed locally that reverting these changes allow the LIT test to pass.

May you please investigate & fix this failure or revert your change to get this build bot back to green?

https://github.com/llvm/llvm-project/pull/134787