Regressions on 4.5 at revision 159523 vs revision 159428

[H.J. Lu ia64]

New failures:
FAIL: gcc.c-torture/execute/builtins/memset-chk.c compilation,  -O3 -fomit-frame-pointer -funroll-loops 
FAIL: gfortran.dg/unit_1.f90  -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  (test for excess errors)

New passes:
FAIL: II -O3 -findirect-dispatch compilation from source
FAIL: gcc.c-torture/compile/20050215-2.c  -O3 -g  (test for excess errors)
FAIL: gcc.c-torture/execute/builtins/pr23484-chk.c compilation,  -O1 
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.