Regressions on trunk at revision 258397 vs revision 258387

[H.J. Lu ia32 -fpic]

New failures:
FAIL: g++.dg/ubsan/pr64984.C   -O1  (internal compiler error)
FAIL: g++.dg/ubsan/pr64984.C   -O1  (test for excess errors)
FAIL: g++.dg/ubsan/vptr-10.C   -O1  (internal compiler error)
FAIL: g++.dg/ubsan/vptr-10.C   -O1  (test for excess errors)
FAIL: gcc.target/i386/pr55512-1.c (internal compiler error)
FAIL: gcc.target/i386/pr55512-1.c (test for excess errors)
FAIL: gcc.target/i386/pr55512-2.c (internal compiler error)
FAIL: gcc.target/i386/pr55512-2.c (test for excess errors)
FAIL: gcc.target/i386/pr55512-3.c (internal compiler error)
FAIL: gcc.target/i386/pr55512-3.c (test for excess errors)
FAIL: gcc.target/i386/pr55512-4.c (internal compiler error)
FAIL: gcc.target/i386/pr55512-4.c (test for excess errors)
FAIL: gcc.target/i386/pr78911-2.c (test for excess errors)

New passes: