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Commit 08a2bfd2 authored by Argyrios Kyrtzidis's avatar Argyrios Kyrtzidis
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Cut down the number of open/close system calls for output files. 

For PCH files, have only one open/close for temporary + rename to be safe from race conditions.
For all other output files open/close the output file directly.

Depends on llvm r136310. rdar://9082880 & http://llvm.org/PR9374.

llvm-svn: 136315
parent b7098a38
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