[compiler-rt] [profile] Implement a non-mmap path when reading profile files from a non-local filesystem (PR #131177)

[Wael Yehia via llvm-commits]

w2yehia wrote:

@petrhosek @david-xl Thank you for your review.
I've left two unresolved comments of yours for you to close or reply to.


https://github.com/llvm/llvm-project/pull/131177