Regressions on native/master at commit r17-398 vs commit r17-396 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r17-398 vs commit r17-396 on Linux/x86_64
New failures:
FAIL: gfortran.dg/coarray/alloc_comp_9.f90 -fcoarray=lib -pthread  -O2  
-lcaf_shmem -lrt execution test

New passes:
FAIL: gfortran.dg/coarray/codimension.f90 -fcoarray=lib -pthread  -O2  
-lcaf_shmem -lrt execution test