[ARMv7] Minor integer fastmem optimization.

This is a one instruction optimization for integer loadstores.
Makes sure to enable nop padding in some cases where a fault can still happen and cause us to overwrite other instructions that aren't meant to be.
Merge pull request #1731 from Sonicadvance1/ARMv7-minor-optimization

[ARMv7] Minor integer fastmem optimization.
Merge branch 'master' into license