Regressions on master at commit r15-889 vs commit r15-888 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-889 vs commit r15-888 on Linux/x86_64
New failures:

New passes:
FAIL: experimental/simd/pr109261_constexpr_simd.cc -msse2 -O2 -Wno-psabi (test 
for excess errors)