Regressions on master at commit r16-6461 vs commit r16-6459 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r16-6461 vs commit r16-6459 on Linux/x86_64
New failures:
FAIL: libgomp.fortran/appendix-a/a.2.1.f90   -O0  execution test
FAIL: libgomp.fortran/appendix-a/a.2.1.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  execution test

New passes:
FAIL: libgomp.fortran/appendix-a/a.2.1.f90   -O1  execution test
FAIL: libgomp.fortran/appendix-a/a.2.1.f90   -O1  execution test
FAIL: libgomp.fortran/appendix-a/a.2.1.f90   -O3 -g  execution test
FAIL: libgomp.fortran/appendix-a/a.2.1.f90   -Os  execution test
FAIL: libgomp.fortran/appendix-a/a.2.1.f90   -Os  execution test