Move no_compiled_jump to recomp module.
Prefer enum over macro for CP0 registers.

Previous macros had high risk of colliding with other identifiers because they were not
capitalized, nor prefixed. Furthermore, some identifier were relatively common (Context, Count,
Compare, ...).
Additionally, cp0 registers array has been explicitely marked as global (g_ prefix).
Merge pull request #36 from bsmiles32/cp0_regs

CP0 regs + no_compiled_jump