[PATCH] SubRegister liveness tracking

[Matthias Braun]

Here is the full patchset to enable subregister liveness tracking in llvm. I did not split all these patches into separate mails because they have to be applied in order and they only really make sense when applied together. For a high-level discussion of the changes, see the mail I sent to the llvmdev mailing list.
The patches have to be applied after applying the set of cleanups here: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130902/187212.html
and the last two small patches for ‘covers’ and ‘advanceTo’.

Greetings
	Matthias

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