Merging r181529:

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r181529 | void | 2013-05-09 11:21:45 -0700 (Thu, 09 May 2013) | 8 lines

Simplify the code a bit.

The compact unwind registers were defined in two different
places. It's better just to place them in the function that uses them
and specify that this is a 64-bit or 32-bit machine.

No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_33@181956 91177308-0d34-0410-b5e6-96231b3b80d8