CPUDetect: add support for MOVBE detection
x64Emitter: Add the MOVBE instruction.
Jit_Util: Provide two util functions to load/store and swap values, using MOVBE internally when possible.
JitAsmCommon: Use MOVBE everywhere it matters (!x86 only code, !old CPU support code).
Jit64: Use LoadAndSwap/SwapAndStore where it makes sense.
Merge pull request #173 from delroth/movbe

Optimize memory access on Haswell by using MOVBE when possible.