Don't muck with currentMIPS->r in the slowmem jit.
Properly save registers before the slowmem call.
Refactor jit slowmem, add lbu to jit since easy.
Fast path scratchpad too, shouldn't be expensive.
Oops, lost the CONDITIONAL_DISABLE.
Optimize static memory read/writes in jit as well.

Like the arm jit does.
Fix 64-bit memory dereferencing.
Since flipping the op is easy, also do lb/lh.
Don't write anything to a bad static pointer.

Not sure what came over me...
Merge pull request #444 from unknownbrackets/jit-minor

Don't muck with currentMIPS->r directly in the slowmem jit