Minor cleanup.
Cleanup some differences between the two jits.
Cleanup some indentation, more compares to 0.
armjit: Disable ext for now, breaks Disgaea?
armjit: Don't use R1 in the regcache.

This way it can be used in swl/swr/ins as a temp reg.
Note: those instructions are currently DISABLEd, though.
Merge pull request #897 from unknownbrackets/jit-minor

Some armjit sync