Regressions on master at commit r15-6423 vs commit r15-6420 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-6423 vs commit r15-6420 on Linux/x86_64
New failures:

New passes:
FAIL: gfortran.dg/class_transformational_2.f90   -Os  execution test