Regressions on trunk at revision 169047 vs revision 168947

[H.J. Lu ia32]

New failures:
FAIL: gcc.dg/torture/stackalign/builtin-return-1.c  -O2 -flto  execution test
FAIL: gcc.dg/torture/stackalign/builtin-return-1.c  -O2 -flto  execution test
FAIL: gcc.target/i386/headmerge-1.c scan-assembler-times 120 1
FAIL: gcc.target/i386/headmerge-2.c scan-assembler-times 120 1

New passes:
FAIL: gcc.dg/guality/nrv-1.c  -O1  line 20 a2.i[0] == 42
FAIL: gcc.dg/guality/nrv-1.c  -O2  line 20 a2.i[0] == 42
FAIL: gcc.dg/guality/nrv-1.c  -Os  line 20 a2.i[0] == 42