[PATCH] Support: Provide a function to get the home directory of an arbitrary user

[Zachary Turner]

Hi rnk,

llvm::sys::path already provides a function home_directory() which returns the current user's home directory.

This patch extends this by implementing a function which returns the home directory of an arbitrary user.  This satisfies a use case in LLDB where we need to resolve paths of the form ~username/path, and since it is similar in nature to the existing home_directory() function, seems generally useful for llvm

http://reviews.llvm.org/D4749

Files:
  include/llvm/Support/Path.h
  lib/Support/Unix/Path.inc
  lib/Support/Windows/Path.inc
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