ARM JIT: Add and simplify some half-word load/store instructions.
JIT the signed load/store variants too
Merge pull request #805 from xsacha/master

Armjit update
ARMJIT: Combine to one instruction for load/stores.
Merge pull request #808 from xsacha/master

Armjit update
ARMJIT: Clean up for load/stores
Put ditherenable & alphaBlendEnable as function
New isAlphaBlendEnabled() & isDitherEnabled()
Merge pull request #809 from raven02/patch-2

Put ditherenable & alphaBlendEnable as function
Merge pull request #811 from xsacha/master

Tidy up load/store jit
Merge remote-tracking branch 'upstream/master' into fps2