[PATCH] Support: add sys::path::canonical

[Alex Lorenz]

Hi bogner, dexonsmith, bob.wilson,

This patch implements the the sys::path::canonical function, which converts a path to its canonical form.

This function is needed for Clang's FileManager::getCanonicalName (there's a FIXME there) and the new
coverage mapping system.

http://reviews.llvm.org/D4745

Files:
  include/llvm/Support/Path.h
  lib/Support/Path.cpp
  unittests/Support/Path.cpp
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