armemu: Implement UQADD8, UQADD16, UQSUB16, UQASX, and UQSAX
dyncom: Implement UQADD8, UQADD16, UQSUB8, UQSUB16, UQASX, and UQSAX.
Merge pull request #350 from lioncash/qops

Implement the rest of the UQ* ops.