[Bug rtl-optimization/58517] ifcvt (after combine) puts ccreg clobbering insn between ccset insn and ccreg use

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58517

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The reason why r6-3654-g6b7e867187889 didn't fix this case is because it was
not looking into clobbers only the set side. 

Note the conditional in my patch should have been
if (reg_overlap_mentioned_p (DF_REF_REG (def), cond))

Maybe it should be bb_valid_for_noce_process_p instead, I am not 100% sure on
that.