Regressions on trunk at revision 157086 vs revision 157082

[H.J. Lu]

New failures:
FAIL: 27_io/basic_istream/extractors_other/wchar_t/9318-in.cc (test for excess errors)
FAIL: Thread_Sleep_2 -O3 -findirect-dispatch compilation from source
FAIL: Thread_Wait compilation from source
FAIL: gcc.dg/guality/vla-1.c  -O1  line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c  -O2  line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c  -O3 -fomit-frame-pointer  line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c  -O3 -g  line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c  -Os  line 24 sizeof (a) == 17 * sizeof (short)

New passes: