Bug 1617639 - No need to pass -LTCG in AR_FLAGS for Windows r=froydnj

Differential Revision: https://phabricator.services.mozilla.com/D63888

--HG--
extra : moz-landing-system : lando

config/config.mk

@@ -136,17 +136,11 @@ ifdef MOZ_PROFILE_GENERATE
 PGO_CFLAGS += -DNS_FREE_PERMANENT_DATA=1
 PGO_CFLAGS += $(if $(filter $(notdir $<),$(notdir $(NO_PROFILE_GUIDED_OPTIMIZE))),,$(PROFILE_GEN_CFLAGS))
 PGO_LDFLAGS += $(PROFILE_GEN_LDFLAGS)
-ifeq (WINNT,$(OS_ARCH))
-AR_FLAGS += -LTCG
-endif
 endif # MOZ_PROFILE_GENERATE
 
 ifdef MOZ_PROFILE_USE
 PGO_CFLAGS += $(if $(filter $(notdir $<),$(notdir $(NO_PROFILE_GUIDED_OPTIMIZE))),,$(PROFILE_USE_CFLAGS))
 PGO_LDFLAGS += $(PROFILE_USE_LDFLAGS)
-ifeq (WINNT,$(OS_ARCH))
-AR_FLAGS += -LTCG
-endif
 endif # MOZ_PROFILE_USE
 endif # NO_PROFILE_GUIDED_OPTIMIZE