Remove JUMP_IF_TRUE/FALSE_OR_POP

[iritkatriel]

JUMP_IF_TRUE_OR_POP and JUMP_IF_FALSE_OR_POP are not very common:

JUMP_IF_TRUE_OR_POP       4,755   0.01%
JUMP_IF_FALSE_OR_POP      3,089   0.01%

Perhaps we can remove them and instead use

DUP_TOP
POP_JUMP_IF_TRUE/FALSE
POP_TOP

[iritkatriel]

These opcodes are only used for short-circuiting and/or/comparison expressions, so they are always jumping forward and I don't see that changing anytime soon. So we can just change them to be relative, we don't need the forwards and backwards versions.