[PATCH] Avoid using the PATH_MAX constant, which may be undefined.

[Sean Silva]

We generally try to avoid putting platform-specific #ifdef's in the core
code, and instead prefer to keep it in libSupport. It would be great if you
pulled this code into libSupport by implementing FileSystem.h's function
`error_code canonicalize(const Twine &path, SmallVectorImpl<char>
&result);` and addressed the nearby FIXME.

-- Sean Silva
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