[PATCH] D43511: [dsymutil] Be smarter in caching calls to realpath

[Davide Italiano via Phabricator via llvm-commits]

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The meta comment I have here is whether we need to segregate this is in `dsymutil` or expose that somewhere else (e.g. in `Support/`).
My feeling is that this utility could be of more general use for pathname resolution.
Among others, `lldb` calls realpath a bit, and maybe there are components in clang doing the same. Jonas, what do you think?


https://reviews.llvm.org/D43511