Regressions on native/releases/gcc-16 at commit r16-9321 vs commit r16-9320 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on releases/gcc-16 at commit r16-9321 vs commit r16-9320 on 
Linux/x86_64
New failures:

New passes:
FAIL: gfortran.dg/coarray/scalar_alloc_1.f90 -fcoarray=lib -pthread  -O2  
-lcaf_shmem -lrt execution test