Regressions on 4.5 at revision 163940 vs revision 163867

[H.J. Lu ia64]

New failures:
FAIL: gcc.c-torture/compile/limits-caselabels.c  -O3 -fomit-frame-pointer  (test for excess errors)
FAIL: gcc.c-torture/execute/builtins/strlen-3.c compilation,  -O2 -fwhopr 
WARNING: program timed out.

New passes:
FAIL: 23_containers/vector/modifiers/erase/moveable.cc (test for excess errors)
FAIL: gcc.c-torture/compile/20030708-1.c  -O2 -fwhopr  (test for excess errors)
FAIL: gcc.c-torture/execute/eeprof-1.c compilation,  -O2 -flto