[LLVMdev] Unaligned SSE Memop Support Patch

[David Greene]

This patch adds a feature to allow SSE memops to be unaligned
on supported architectures.

Mostly I want to see if the naming is reasonable.

Supporting unaligned memops requires a bit twiddle on 10h
processors.  This patch makes the assumption that the OS
sets the bit correctly.

Comments?

                             -Dave

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