Regressions on releases/gcc-15 at commit r15-11268 vs commit r15-11200 on Linux/x86_64

[Haochen Jiang]

Regressions on releases/gcc-15 at commit r15-11268 vs commit r15-11200 on Linux/x86_64
New failures:
FAIL: 30_threads/async/async.cc  -std=gnu++17 execution test
FAIL: gcc.dg/sarif-output/bad-pragma.c bad-pragma.py::test_messages_have_embedded_urls - assert "unknown opti...s.html)' kind" == "unknown opti...s.html)' kind
FAIL: gcc.dg/sarif-output/bad-pragma.c bad-pragma.py::test_messages_have_embedded_urls - assert "unknown opti...s.html)' kind" == "unknown opti...s.html)' kind

New passes:
FAIL: gcc.dg/sarif-output/bad-pragma.c bad-pragma.py::test_messages_have_embedded_url
FAIL: gcc.dg/sarif-output/bad-pragma.c bad-pragma.py::test_messages_have_embedded_url