Regressions on master at commit r15-2433 vs commit r15-2429 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r15-2433 vs commit r15-2429 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.dg/torture/convert-dfp-2.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
FAIL: gcc.dg/torture/convert-dfp.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
FAIL: gfortran.dg/pr105361.f90   -O0  execution test
FAIL: gfortran.dg/pr105361.f90   -O1  execution test
FAIL: gfortran.dg/pr105361.f90   -O2  execution test
FAIL: gfortran.dg/pr105361.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  execution test
FAIL: gfortran.dg/pr105361.f90   -O3 -g  execution test
FAIL: gfortran.dg/pr105361.f90   -Os  execution test