Commit 43693615 authored by Yi Kong's avatar Yi Kong
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[Upstream] Fix macOS build after r358716 

COPYFILE_CLONE is only defined on newer macOS versions, using it without
check breaks build on systems running legacy OS and toolchain.

Differential Revision: https://reviews.llvm.org/D65317

Change-Id: I49cdba5a1d6555d76180e5ae20e1e5d9b65330eb
llvm-svn: 367084
parent 84c7cf71
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