Create helper functions to more easily instantiate alu and jmp operations

[thatjiaozi]

• Create helper functions to more easily instantiate alu and jmp instructions
• Increase the test coverage for alu and jmp operations
• rename IMMJMPInstruction to JmpImmInstruction
• rename RegJMPInstruction to JmpRegInstruction (both renames are for consistency with the rest of the instruction naming)
• update the strategies so they use these helper functions instead (full upgrade of the strategies rolling in the next set of patches)