Regressions on native/master at commit r15-8932 vs commit r15-8926 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-8932 vs commit r15-8926 on Linux/x86_64
New failures:

New passes:
FAIL: gfortran.dg/gomp/append-args-interop.f90   -O  (test for excess errors)
FAIL: gfortran.dg/gomp/append-args-interop.f90   -O  (test for excess errors)