Regressions on native/master at commit r17-839 vs commit r17-837 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r17-839 vs commit r17-837 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.dg/guality/pr41447-1.c   -O1  -DPREVENT_OPTIMIZATION  execution test