Regressions on master at commit r13-4474 vs commit r13-4469 on Linux/i686

[H.J. Lu]

New failures:

New passes:
FAIL: gfortran.dg/merge_1.f90   -O0  execution test
FAIL: gfortran.dg/merge_1.f90   -O1  execution test
FAIL: gfortran.dg/merge_1.f90   -O2  execution test
FAIL: gfortran.dg/merge_1.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  execution test
FAIL: gfortran.dg/merge_1.f90   -O3 -g  execution test
FAIL: gfortran.dg/merge_1.f90   -Os  execution test