Enable Comp_VPFX.
Oops, can't have CONDITIONAL_DISABLE here, no op.
Add some checks for fpu/vfpu writing to $0.
Oops, vfpu was missing CONDITIONAL_DISABLEs.
Check for s/t/d prefix reg changes in jit.
Merge pull request #692 from unknownbrackets/jit-vfpu

Prep work for vfpu jit