Padding instruction sequence with JA 0

[michaeldwong]

Slots in the program have JA 0 instructions (instead of NOPs) after superoptimization so that the length of the optimized output instruction sequence is equivalent to the input instruction sequence; these JA 0 instructions have very little to no overhead. This is so that the optimized instructions can be patched into the ELF while still having the ELF offsets, reloc data, etc. still be applied. Future work includes ELF modifications so that an instruction sequence with a smaller length can be patched in without adding JA 0 instructions.