CommandProcessor: mark some functions as static
Merge pull request #838 from Tilka/unused

CommandProcessor: mark some functions as static
DiscIO: Make the unordered set in IsSoundFile static

Doesn't need to be instantiated every time the function is called.
Merge pull request #875 from lioncash/statics

DiscIO: Make the unordered set in IsSoundFile static
PPCFP: add comment
Merge pull request #884 from FioraAeterna/ppcfpopt

PPCFP: add comment
Refactor SetCpStatus into two functions for from-GPU and from-CPU mode rather than a boolean parameter.

This shouldn't affect functionality.  I'm not sure if the breakpoint
distinction is actually necessary (my commit messages from the old
dc-netplay last year claim that breakpoints are broken anyway, but I
don't remember why), but I don't actually need to change this part of
the code (yet), so I'll stick with the trimmings change for now.
A tiny restructuring to allow inlining of FifoCommandRunnable.  Probably useless.
Add Flag support to ChunkFile.h
Unify three types of non-FIFO requests to the GPU thread around Common::Event and Common::Flag.

The only possible functionality change is that s_efbAccessRequested and
s_swapRequested are no longer reset at init and shutdown of the OGL
backend (only; this is the only interaction any files other than
MainBase.cpp have with them).  I am fairly certain this was entirely
vestigial.

Possible performance implications: efbAccessReady now uses an Event
rather than spinning, which might be slightly slower, but considering
the slow loop the flags are being checked in from the GPU thread, I
doubt it's noticeable.

Also, this uses sequentially consistent rather than release/acquire
memory order, which might be slightly slower, especially on ARM...
something to improve in Event/Flag, really.
Merge pull request #867 from comex/gpu-determinism-pr1

Some small preparatory changes to VideoCommon for GPU thread determinism mode.
Bugfixes for fmul rounding

Fix the places I forgot to add Force25Bit, and fix an incredibly silly typo bug
Merge pull request #887 from FioraAeterna/fmulinterp

Bugfixes for fmul rounding
Fix another absent-minded typo in the fmul interpreter patch
Merge pull request #888 from FioraAeterna/fmulinterp

Fix another absent-minded typo in the fmul interpreter patch
Rename Log2 and add IsPow2 to MathUtils for future use

Also remove unused pow2/pow2f functions.
JIT64: optimize multiplication by immediate constants

Factor out common code and handle a few more common cases.
JIT64: optimize rlwinmx/rlwinix and friends

Take advantage of movzx as a replacement for anding with 0xff or 0xffff, and
abuse loads from the register cache to save ops.
JIT64: Optimize cmpXX

Use TEST instead of CMP if we're comparing against 0 (rather common), and
optimize the case of immediate compares further.
JIT64: optimize sign/zero-extend

Also remove some comments that no longer apply since x86_32 was dropped.