GBA Memory: partially unroll loops for LDM/STM and add UNLIKELYs
GBA Memory: partially unroll loops for LDM/STM and add UNLIKELYs

Anty-Lemon/mgba,jeremyherbert/mgba,Iniquitatis/mgba,libretro/mgba,iracigt/mgba,bentley/mgba,mgba-emu/mgba,libretro/mgba,AdmiralCurtiss/mgba,cassos/mgba,mgba-emu/mgba,zerofalcon/mgba,mgba-emu/mgba,bentley/mgba,fr500/mgba,matthewbauer/mgba,libretro/mgba,askotx/mgba,fr500/mgba,libretro/mgba,zerofalcon/mgba,askotx/mgba,Anty-Lemon/mgba,Iniquitatis/mgba,iracigt/mgba,matthewbauer/mgba,jeremyherbert/mgba,zerofalcon/mgba,fr500/mgba,Anty-Lemon/mgba,cassos/mgba,cassos/mgba,nattthebear/mgba,jeremyherbert/mgba,Touched/mgba,MerryMage/mgba,sergiobenrocha2/mgba,Iniquitatis/mgba,nattthebear/mgba,Touched/mgba,MerryMage/mgba,fr500/mgba,Touched/mgba,jeremyherbert/mgba,mgba-emu/mgba,AdmiralCurtiss/mgba,iracigt/mgba,Anty-Lemon/mgba,AdmiralCurtiss/mgba,sergiobenrocha2/mgba,Iniquitatis/mgba,libretro/mgba,iracigt/mgba,sergiobenrocha2/mgba,MerryMage/mgba,askotx/mgba,askotx/mgba,sergiobenrocha2/mgba,sergiobenrocha2/mgba