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Commit 6c92cdff authored by Dan McGregor's avatar Dan McGregor Committed by Fangrui Song
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Initial implementation of -fmacro-prefix-map and -ffile-prefix-map 

GCC 8 implements -fmacro-prefix-map. Like -fdebug-prefix-map, it replaces a string prefix for the __FILE__ macro.
-ffile-prefix-map is the union of -fdebug-prefix-map and -fmacro-prefix-map

Reviewed By: rnk, Lekensteyn, maskray

Differential Revision: https://reviews.llvm.org/D49466
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