Regressions on releases/gcc-15 at commit r15-9937 vs commit r15-9936 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on releases/gcc-15 at commit r15-9937 vs commit r15-9936 on 
Linux/x86_64
New failures:

New passes:
FAIL: 30_threads/async/async.cc  -std=gnu++17 execution test