Changelog for 3.0-655

Merge branch 'misc-speedups'

* misc-speedups:
  fixed and reenabled and slightly optimized the JIT version of fcmpo/fcmpu.
  slightly more precise speed percent display (this is really minor)
  a small thread synchronization speedup for dual core mode. it's most noticeable in games where the CPU is running behind compared to the GPU.

Conflicts:
	Source/Core/Core/Src/PowerPC/Jit64/Jit.cpp

The Fifo.cpp changes from rdaefb3b550e2 was not merged as there was no performance benefit.