[libc] Adjust few fcntl macros for aarch64.
[libc] Add implementations of POSIX mkdir, mkdirat, rmdir, unlink and unlinkat.Reviewed By: michaelrjDifferential Revision: https://reviews.llvm.org/D118641
[libc] Add implementations of the POSIX creat and openat functions.Reviewed By: michaelrjDifferential Revision: https://reviews.llvm.org/D118435
[libc] Add POSIX close, fsync, open, read and write functions.They are implemented as simple syscall wrappers. The file creationmacros have been put in a header file as a temporary solution until
[libc] Add POSIX close, fsync, open, read and write functions.They are implemented as simple syscall wrappers. The file creationmacros have been put in a header file as a temporary solution until wehave a cleaner approach to listing platform relevant macros.Reviewed By: abrachetDifferential Revision: https://reviews.llvm.org/D118396
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