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android: add a close-on-exec check on pipe()

Authored by george.burgess.iv on Jun 5 2019, 10:21 PM.

Description

android: add a close-on-exec check on pipe()

On Android, pipe() is better to be replaced by pipe2() with O_CLOEXEC
flag to avoid file descriptor leakage.

Patch by Jian Cai!

Differential Revision: https://reviews.llvm.org/D61967

llvm-svn: 362673