Makefile.pre.in: allow pgo to fail

This partially reverts python@6ab6040#diff-1f0a8db227d22005511b0d90f5339b97db345917b863954b3b3ccb9ec308767cL709

Author: naveen521kk

Makefile.pre.in

@@ -768,7 +768,7 @@ profile-run-stamp:
 	$(MAKE) profile-gen-stamp
 	# Next, run the profile task to generate the profile information.
 	@ # FIXME: can't run for a cross build
-	$(LLVM_PROF_FILE) $(RUNSHARED) ./$(BUILDPYTHON) $(PROFILE_TASK)
+	$(LLVM_PROF_FILE) $(RUNSHARED) ./$(BUILDPYTHON) $(PROFILE_TASK) || true
 	$(LLVM_PROF_MERGER)
 	# Remove profile generation binary since we are done with it.
 	$(MAKE) clean-retain-profile
@@ -817,7 +817,7 @@ profile-bolt-stamp: $(BUILDPYTHON)
 	  mv "$${bin}.bolt_inst" "$${bin}"; \
 	done
 	# Run instrumented binaries to collect data.
-	$(RUNSHARED) ./$(BUILDPYTHON) $(PROFILE_TASK)
+	$(RUNSHARED) ./$(BUILDPYTHON) $(PROFILE_TASK) || true
 	# Merge all the data files together.
 	for bin in $(BOLT_BINARIES); do \
 	  @MERGE_FDATA@ $${bin}.*.fdata > "$${bin}.fdata"; \