Regressions on trunk at revision 248966 vs revision 248944

[Intel Automatic Testing System [ia32 Core AVX2 PIC]]

New failures:
FAIL: c-c++-common/ubsan/pr80932.c   -O0  execution test
FAIL: c-c++-common/ubsan/pr80932.c   -O0  execution test

New passes:
FAIL: gcc.dg/vect/slp-perm-8.c -flto -ffat-lto-objects (internal compiler error)
FAIL: gcc.dg/vect/slp-perm-8.c -flto -ffat-lto-objects (test for excess errors)
FAIL: gcc.dg/vect/slp-perm-8.c (internal compiler error)
FAIL: gcc.dg/vect/slp-perm-8.c (test for excess errors)