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After r361885, realPathFromHandle() ends up getting called on the working directory on each Clang invocation. This unveiled that the code didn't work for paths on network shares. For example, if one maps the local dir c:\src\tmp to x: net use x: \\localhost\c$\tmp and run e.g. "clang -c foo.cc" in x:\, realPathFromHandle will get \\?\UNC\localhost\c$\src\tmp\ back from GetFinalPathNameByHandleW, and would strip off the initial \\?\ prefix, ending up with a path that doesn't work. This patch makes the prefix stripping a little smarter to handle this case. Differential revision: https://reviews.llvm.org/D67166 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371035 91177308-0d34-0410-b5e6-96231b3b80d8