PR middle-end/44671
	PR middle-end/44686
	* tree.c (build_function_decl_skip_args): Clear DECL_BUILT_IN on signature
	change.
	* ipa-split.c (split_function): Always clear DECL_BUILT_IN.
	* ipa-prop.c (ipa_modify_formal_parameters): Likewise.

	* gcc.c-torture/pr44686.c: New file.

From-SVN: r161476