https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119291
--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So before combine we have:
```
(insn 23 22 24 4 (set (reg/v:SI 117 [ eD.2775 ])
(reg/v:SI 116 [ eD.2775 ])) 85 {*movsi_internal}
(expr_list:REG_DEAD (reg/v:SI 116 [ eD.2775 ])
(nil)))
(insn 24 23 25 4 (parallel [
(set (reg/v:SI 116 [ eD.2775 ])
(neg:SI (reg:SI 104 [ _7 ])))
(clobber (reg:CC 17 flags))
]) "/app/example.cpp":23:7 804 {*negsi_1}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))
(insn 25 24 26 4 (set (reg:CCZ 17 flags)
(compare:CCZ (reg/v:SI 116 [ eD.2775 ])
(const_int 0 [0]))) "/app/example.cpp":24:11 7 {*cmpsi_ccno_1}
(nil))
```
It seems like combine moved the setting of 116 in insn 24 before the use of
insn 23. but I can't see where though; I think it is when it is trying to be do
extra CC combines.
