Regressions on trunk at revision 255495 vs revision 255461

[H.J. Lu ia32 Core i7]

New failures:
FAIL: gfortran.dg/maxval_char_1.f90   -O2  execution test

New passes:
FAIL: gcc.dg/builtin-stringop-chk-9.c  (test for warnings, line 125)
FAIL: gcc.dg/builtin-stringop-chk-9.c  (test for warnings, line 133)
FAIL: gcc.dg/builtin-stringop-chk-9.c  (test for warnings, line 141)
FAIL: gcc.dg/builtin-stringop-chk-9.c  (test for warnings, line 149)