[Bug rtl-optimization/63917] [5 Regression] r217646 caused many failures

[zhenqiang.chen at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63917

--- Comment #3 from Zhenqiang Chen <zhenqiang.chen at arm dot com> ---
Root cause: r217646 enhances ifcvt to handle cbranchcc4 instruction. But ifcvt
does not check whether an insn will clobber CC or not, when moving it before
the cbranchcc4 instruction.

I will work out a patch to fix it.