Regressions on trunk at revision 169047 vs revision 169035

[H.J. Lu Intel64-profiled]

New failures:
FAIL: gcc.dg/guality/pr43479.c  -O2 -flto -flto-partition=none  line 18 h == 9
FAIL: gcc.dg/guality/vla-2.c  -O2 -flto  line 25 sizeof (a) == 6 * sizeof (int)
FAIL: gcc.target/i386/headmerge-1.c scan-assembler-times 120 1
FAIL: gcc.target/i386/headmerge-1.c scan-assembler-times 120 1
FAIL: gcc.target/i386/headmerge-2.c scan-assembler-times 120 1
FAIL: gcc.target/i386/headmerge-2.c scan-assembler-times 120 1

New passes:
FAIL: gcc.dg/guality/vla-2.c  -O3 -fomit-frame-pointer  line 25 sizeof (a) == 6 * sizeof (int)
FAIL: gcc.dg/guality/vla-2.c  -O3 -g  line 25 sizeof (a) == 6 * sizeof (int)