[PATCH] [Support][Program] Add findProgramByName(Name, OptionalPaths)

[Michael Spencer]

Hi aaron.ballman, asl,

This adds a replacement for FindProgramByName that accepts an optional list of paths to search. The main intent of this change is to move the code in Clang that searches for tools over to this API so that we correctly find .exe files on Windows.

Followup patches move all users of FindProgramByName over and remove it.

http://reviews.llvm.org/D6067

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