[Bug bootstrap/100787] New: [12 Regression] Bootstrap failure caused by r12-1077

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100787

            Bug ID: 100787
           Summary: [12 Regression] Bootstrap failure caused by r12-1077
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: aldyh at redhat dot com
  Target Milestone: ---
            Target: i686

On Linux/i686, r12-1077 failed to bootstrap when configured with

--prefix=/export/project/git/gcc-bisect-bootstrap/master/r12-1077/usr
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld
--with-fpmath=sse --enable-languages=c,c++ --enable-cet i686-linux
--enable-bootstrap --with-fpmath=sse --disable-libcc1 --disable-libcilkrts
--disable-libsanitizer

Comparing stages 2 and 3 
Bootstrap comparison failure!
gcc/tree-vrp.o differs