Regressions on master at commit r15-3903 vs commit r15-3898 on Linux/i686

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-3903 vs commit r15-3898 on Linux/i686
New failures:
FAIL: gfortran.dg/initialization_25.f90   -O   xfail *-*-*  (test for errors, 
line 11)

New passes:
FAIL: 30_threads/future/members/poll.cc  -std=gnu++17 execution test
FAIL: gfortran.dg/initialization_25.f90   -O   (test for errors, line 11)