[Bug rtl-optimization/49847] [4.7/4.8/4.9 Regression] NULL deref in fold_rtx (prev_insn_cc0 == NULL)

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49847

--- Comment #34 from Jeffrey A. Law <law at redhat dot com> ---
OK.  Then I suggest two immediate things to do.

1. Fix the documentation for cc0 targets to indicate that the setter/user no
longer have to be consecutive, particularly in the presence of
flag_trapping_math.

2. Fault in fixes.  While a review of every bit of HAVE_cc0 code is warranted,
I'm not terribly inclined as HAVE_cc0 targets simply aren't that important
anymore.