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[libc] Add write(2) implementation for Linux and FDReader test utility

Authored by abrachet on Apr 17 2020, 10:21 AM.

Description

[libc] Add write(2) implementation for Linux and FDReader test utility

Summary: Adds write for Linux and FDReader utility which should be useful for some stdio tests as well.

Reviewers: sivachandra, PaulkaToast

Reviewed By: sivachandra

Subscribers: mgorny, tschuett, libc-commits

Differential Revision: https://reviews.llvm.org/D78184