This option enables LTO for stage2 and stage3 on

hosts without linker plugin support.

STAGE2_CFLAGS += -flto=jobserver -frandom-seed=1 -ffat-lto-objects STAGE3_CFLAGS += -flto=jobserver -frandom-seed=1 -ffat-lto-objects STAGEprofile_CFLAGS += -flto=jobserver -frandom-seed=1 STAGEtrain_CFLAGS += -flto=jobserver -frandom-seed=1 STAGEfeedback_CFLAGS += -flto=jobserver -frandom-seed=1 do-compare = /bin/true