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

[via llvm-commits]

dgg5503 wrote:

Hi @chestnykh ,

I have reverted these changes in an attempt to get the `llvm-clang-x86_64-sie-win` Build Bot passing again. I did a small amount of investigation into the failure -- I am curious if the logic here:
https://github.com/llvm/llvm-project/blob/d6c8e8908d421979a428ede9f9a630dac8576c5b/llvm/lib/Support/FileOutputBuffer.cpp#L189-L192

needs to be flipped. If my understanding is correct, then I believe flags should also be set to 0 in https://github.com/llvm/llvm-project/blob/d6c8e8908d421979a428ede9f9a630dac8576c5b/llvm/unittests/Support/FileOutputBufferTest.cpp#L126

Please let me know what you think.

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