ea95f31f99
DUP_X1; POP = SWAP p1_a; p1_b; SWAP = p1_b; p1_a where p1_a, p1_b are instructions without side effects pushing value of size 1 on stack. E.g.: ACONST_NULL; ALOAD 0; SWAP = ALOAD 0; ACONST_NULL NOP; NOP = NOP