[ARM] Implements more fastmem instructions in lXX.
There are a few instructions in lXX that aren't currently fastmem capable due to using a register offset.
This implements fastmem for those few instructions.
Really I'll be changing how ARMv7 fastmem works in the future so this is really temporary code.
Just don't know how long it'll stay.
This relies on PR #257
Merge pull request #258 from Sonicadvance1/More-Fastmem

[ARM] Implements more fastmem instructions in lXX.