Regressions on master at commit r16-2107 vs commit r16-2099 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r16-2107 vs commit r16-2099 on Linux/x86_64
New failures:
FAIL: gcc.dg/guality/pr41447-1.c   -O2 -flto -fuse-linker-plugin 
-fno-fat-lto-objects  -DPREVENT_OPTIMIZATION execution test
FAIL: gcc.dg/guality/pr41447-1.c   -Os  -DPREVENT_OPTIMIZATION  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