Add min and max to the x86 jit portfolio.
Implement movz/movn in the x86 jit.
Implement bitrev in x86 jit + some imms.
Protect against some writes to $0.
Reset llBit on thread switch.

Never actually seen ll used, though... but this way it should
work as advertized, as long as a syscall doesn't happen in between...
Merge branch 'cpu-minor' into jit-minor
Don't need this with the imm code path.
Make bitrev use less instructions in the x86 jit.

Much less.
Merge pull request #750 from unknownbrackets/jit-minor

Some minor x86 jitting