function-tests.c: expose selftest::make_fndecl for use elsewhere

This is used by new selftests in the analyzer patch kit.

gcc/ChangeLog:
	* function-tests.c (selftest::make_fndecl): Make non-static.
	* selftest.h (selftest::make_fndecl): New decl.

From-SVN: r279242

gcc/ChangeLog

+2019-12-11  David Malcolm  <dmalcolm@redhat.com>
+
+	* function-tests.c (selftest::make_fndecl): Make non-static.
+	* selftest.h (selftest::make_fndecl): New decl.
+
 2019-12-11  Lewis Hyatt  <lhyatt@gmail.com>
 
 	PR 91853

gcc/function-tests.c

@@ -82,11 +82,11 @@ namespace selftest {
 
 /* Helper function for selftests of function-creation.  */
 
-static tree
+tree
 make_fndecl (tree return_type,
 	     const char *name,
 	     vec <tree> &param_types,
-	     bool is_variadic = false)
+	     bool is_variadic)
 {
   tree fn_type;
   if (is_variadic)

gcc/selftest.h

@@ -171,6 +171,13 @@ class line_table_test
   ~line_table_test ();
 };
 
+/* Helper function for selftests that need a function decl.  */
+
+extern tree make_fndecl (tree return_type,
+			 const char *name,
+			 vec <tree> &param_types,
+			 bool is_variadic = false);
+
 /* Run TESTCASE multiple times, once for each case in our test matrix.  */
 
 extern void