Jit64: subfic - Optimize constants for d != a

These optimizations were already present, but only when d == a. They
also make sense when this condition does not hold.

- imm == 0
Before:
41 BB 00 00 00 00    mov         r11d,0
45 2B DF             sub         r11d,r15d

After:
45 8B DF             mov         r11d,r15d
41 F7 DB             neg         r11d

- imm == -1
Before:
41 BD FF FF FF FF    mov         r13d,0FFFFFFFFh
44 2B EE             sub         r13d,esi
0F 93 45 68          setae       byte ptr [rbp+68h]

After:
44 8B EE             mov         r13d,esi
41 F7 D5             not         r13d
C6 45 68 01          mov         byte ptr [rbp+68h],1

0 files changed, 0 insertions, 0 deletions