Move around the jit nice delay slot logic.

Nice delay slots don't not save flags, they run before the CMP.
Simplify nice delay slot detect, and yes for noop.

NOOP seems very common so this should already benefit speed a bit.
Add a quick disable define for nice delay slots.
Whitelist common delay slot ops with outreg info.
Add support for FPU and VFPU for nice delay slots.
Merge pull request #490 from unknownbrackets/jit-nice-delays

Nice delay slots, ahoy