Regressions on trunk at revision 167794 vs revision 167781

[H.J. Lu Intel64-profiled]

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

New passes:
FAIL: g++.dg/other/first-global.C scan-assembler _GLOBAL__I(_|_65535_0_)foobar
FAIL: g++.dg/other/first-global.C scan-assembler _GLOBAL__I(_|_65535_0_)foobar
FAIL: gcc.dg/guality/pr43479.c  -O2 -flto  line 18 h == 9
FAIL: gcc.dg/guality/vla-2.c  -O2  line 25 sizeof (a) == 6 * sizeof (int)