decl.c (omp_declare_variant_finalize_one): Call declare_simd_adjust_this not just on the context...

	* decl.c (omp_declare_variant_finalize_one): Call
	declare_simd_adjust_this not just on the context, but also on the
	variant-id expression for methods.  Don't call
	cp_get_callee_fndecl_nofold, call cp_get_callee and only if it is
	safe cp_get_fndecl_from_callee.  Don't try to print as %qD
	NULL in diagnostics.
	* pt.c (tsubst_attribute): Handle "omp declare variant base"
	attribute.
	(tsubst_function_decl): Call omp_declare_variant_finalize
	if there are any "omp declare variant base" attributes left.

	* g++.dg/gomp/declare-variant-7.C: New test.
	* g++.dg/gomp/declare-variant-8.C: New test.

From-SVN: r277814