Regressions on master at commit r15-2989 vs commit r15-2986 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-2989 vs commit r15-2986 on Linux/x86_64
New failures:
FAIL: gfortran.dg/sizeof_6.f90   -O1  execution test

New passes:
FAIL: gcc.dg/lto/save-temps c_lto_save-temps_0.o-c_lto_save-temps_0.o link,  -O 
-flto -save-temps