Regressions on native/releases/gcc-16 at commit r16-9115 vs commit r16-9113 on Linux/x86_64

[Haochen Jiang]

Regressions on releases/gcc-16 at commit r16-9115 vs commit r16-9113 on Linux/x86_64
New failures:
FAIL: 27_io/basic_istream/ignore/wchar_t/94749.cc  -std=gnu++20 execution test
FAIL: gfortran.dg/coarray/move_alloc_1.f90 -fcoarray=lib -pthread  -O2  -lcaf_shmem -lrt execution test
FAIL: gfortran.dg/coarray/pr85510.f90 -fcoarray=lib -pthread  -O2  -lcaf_shmem -lrt execution test
FAIL: gfortran.dg/coarray/proc_pointer_assign_1.f90 -fcoarray=lib -pthread  -O2  -lcaf_shmem -lrt execution test

New passes: