Regressions on master at commit r15-5921 vs commit r15-5918 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-5921 vs commit r15-5918 on Linux/x86_64
New failures:

New passes:
FAIL: gfortran.dg/sizeof_6.f90   -O1  execution test