Yi Kong 1755abe1fb 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

llvm-svn: 367084

2019-07-26 05:17:14 +00:00

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