[Bug libgcc/66874] RFE: x86_64_fallback_frame_state more robust

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66874

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-07-15
                 CC|                            |hjl.tools at gmail dot com
     Ever confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
I have seen bogus PC like 0xffffffb2 on i386:

https://sourceware.org/bugzilla/show_bug.cgi?id=18635