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COFF: Cache the result of library searches.
File system operations were still dominating the profile on Windows. In this case we were spending a significant amount of our time repeatedly searching for libraries as a result of processing linker directives. Address this by caching whether we have already found a library with a given name. For chrome_child.dll: Before: 10.53s After: 6.88s Differential Revision: https://reviews.llvm.org/D27840 llvm-svn: 289915
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