Regressions on trunk at revision 218685 vs revision 218666

[H.J. Lu ia32 -fpic]

New failures:
FAIL: c-c++-common/ubsan/object-size-9.c   -O2  output pattern test, is c-c++-common/ubsan/object-size-9.c:21:11: runtime error: load of address 0xff849a7c with insufficient space for an object of type 'char'
FAIL: c-c++-common/ubsan/object-size-9.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  output pattern test, is c-c++-common/ubsan/object-size-9.c:21:11: runtime error: load of address 0xffbce35c with insufficient space for an object of type 'char'
FAIL: g++.dg/cpp1y/pr63996.C  -std=c++14 (test for excess errors)

New passes:
FAIL: c-c++-common/ubsan/object-size-9.c   -O2  output pattern test, is c-c++-common/ubsan/object-size-9.c:21:11: runtime error: load of address 0xff83d49c with insufficient space for an object of type 'char'
FAIL: c-c++-common/ubsan/object-size-9.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  output pattern test, is c-c++-common/ubsan/object-size-9.c:21:11: runtime error: load of address 0xffbf8edc with insufficient space for an object of type 'char'
FAIL: g++.dg/ubsan/cxx1y-vla.C   -O0  execution test
FAIL: g++.dg/ubsan/cxx1y-vla.C   -O1  execution test
FAIL: g++.dg/ubsan/cxx1y-vla.C   -O2  execution test
FAIL: g++.dg/ubsan/cxx1y-vla.C   -O2 -flto -fno-use-linker-plugin -flto-partition=none  execution test
FAIL: g++.dg/ubsan/cxx1y-vla.C   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  execution test
FAIL: g++.dg/ubsan/cxx1y-vla.C   -O3 -fomit-frame-pointer  execution test
FAIL: g++.dg/ubsan/cxx1y-vla.C   -O3 -g  execution test
FAIL: g++.dg/ubsan/cxx1y-vla.C   -Os  execution test