Regressions on 4.5 at revision 161586 vs revision 161475

[H.J. Lu ia64]

New failures:
FAIL: gcc.c-torture/compile/20090907-1.c  -O3 -fomit-frame-pointer -funroll-loops  (test for excess errors)
FAIL: gcc.c-torture/execute/int-compare.c compilation,  -O2 -fwhopr 
FAIL: gfortran.dg/class_allocate_1.f03  -O0  (test for excess errors)
WARNING: program timed out.

New passes:
FAIL: Thread_Sleep_2 -O3 compilation from source
FAIL: gfortran.dg/vector_subscript_3.f90  -O3 -fomit-frame-pointer -funroll-loops  (test for excess errors)