VertexShaderGen: Correct vertex shader output to consider shifted pixel centers.

Fixes issue 267.
Fix Fastmem on CPUs without MOVBE

The problem was that when BSWAP was used, UnsafeWriteRegToReg() returned
the address of that instead of the MOV.
Merge pull request #311 from Tilka/movbe

Fix Fastmem on CPUs without MOVBE
Fix missing instructions in ARM JIT Tables.
The ARM insturction tables were missing addcox, addeox, and subfcox.
Implements support for addcox and addeox to the ArmJit, required little work since they are basically the same as addcx and addex.
Merge pull request #313 from Sonicadvance1/Fix-ARMTables

Fixes missing instructions in ARM JIT Tables.
Merge pull request #306 from neobrain/pixel_center_correction

VertexShaderGen: Correct vertex shader output to consider shifted pixel centers.