Add some common variations of the thumb add immediate to sp instruction.
Fixed bug where if a thumb immediate is a negative number it didn't report an out of range error.
Fixed correctly this time.
Add some common variations of the thumb add immediate to sp instruction.
Merge branch 'ThumbAddSubSP' of https://github.com/Normmatt/armips into ThumbAddSubSP
Correctly handle negative immediate in sub variants.
Merge pull request #7 from Normmatt/ThumbAddSubSP

Add some common variations of the thumb add immediate to sp instruction.