[PATCH] Update TargetTriple Format Info

[Neeraj Badlani]

<abi> is the object format 

Source:
http://clang.llvm.org/docs/CrossCompilation.html

The triple has the general format <arch><sub>-<vendor>-<sys>-<abi>, where:
arch = x86, arm, thumb, mips, etc.
sub = for ex. on ARM: v5, v6m, v7a, v7m, etc.
vendor = pc, apple, nvidia, ibm, etc.
sys = none, linux, win32, darwin, cuda, etc.
abi = eabi, gnu, android, macho, elf, etc.

http://reviews.llvm.org/D6543