Jit64/JitIL: Enabled block merging to improved the performance. This improves the fps 4-5 faster in some games. However it decreases the fps 10 slower in other games, MP2 and etc. In this commit, the actual block merging is disabled. If you want to try block merging, please set FUNCTION_FOLLOWING_THRESHOLD to a positive integer.
Increased the size of code buffer to prevent cache clearing with block merging.