Don't call targetm.calls.static_chain in non-static function

Don't call targetm.calls.static_chain in non-static function

2017-12-20  Tom de Vries  <tom@codesourcery.com>

	PR middle-end/83423
	* config/i386/i386.c (ix86_static_chain): Move DECL_STATIC_CHAIN test ...
	* calls.c (rtx_for_static_chain): ... here.  New function.
	* calls.h (rtx_for_static_chain): Declare.
	* builtins.c (expand_builtin_setjmp_receiver): Use rtx_for_static_chain
	instead of targetm.calls.static_chain.
	* df-scan.c (df_get_entry_block_def_set): Same.

From-SVN: r255849