[PATCH] Canonicalise Windows target triple spellings

[Saleem Abdulrasool]

Hi majnemer, rnk, chandlerc,

Construct a uniform Windows target triple nomenclature which is congruent to the
Linux counterpart.  The old triples are normalised to the new canonical form.
This cleans up the long-standing issue of odd naming for various Windows
environments.

There are four different environments on Windows:

MSVC: The MS ABI, MSVCRT environment as defined by Microsoft
GNU: The MinGW32/MinGW32-W64 environment which uses MSVCRT and auxiliary libraries
Itanium: The MSVCRT environment + libc++ built with Itanium ABI
Cygnus: The Cygwin environment which uses custom libraries for everything

The following spellings are now written as:

i686-pc-win32 => i686-pc-windows-msvc
i686-pc-mingw32 => i686-pc-windows-gnu
i686-pc-cygwin => i686-pc-windows-cygnus

This should be sufficiently flexible to allow us to target other windows
environments in the future as necessary.

http://llvm-reviews.chandlerc.com/D2947

Files:
  include/llvm/ADT/Triple.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/MC/MCObjectFileInfo.cpp
  lib/Support/Triple.cpp
  lib/Target/TargetLibraryInfo.cpp
  lib/Target/X86/X86Subtarget.h
  unittests/ADT/TripleTest.cpp
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