remove an unused function.

* vm.c (rb_sourcefilename): removed because nobody use it.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60788 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

internal.h

@@ -1766,7 +1766,6 @@ void rb_thread_recycle_stack_release(VALUE *);
 void rb_vm_change_state(void);
 void rb_vm_inc_const_missing_count(void);
 const void **rb_vm_get_insns_address_table(void);
-VALUE rb_sourcefilename(void);
 VALUE rb_source_location(int *pline);
 const char *rb_source_loc(int *pline);
 void rb_vm_pop_cfunc_frame(void);

vm.c

@@ -1251,20 +1251,7 @@ rb_lastline_set(VALUE val)
 
 /* misc */
 
-VALUE
-rb_sourcefilename(void)
-{
-    const rb_execution_context_t *ec = GET_EC();
-    const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
-
-    if (cfp) {
-	return rb_iseq_path(cfp->iseq);
-    }
-    else {
-	return Qnil;
-    }
-}
-
+/* in intern.h */
 const char *
 rb_sourcefile(void)
 {
@@ -1279,6 +1266,7 @@ rb_sourcefile(void)
     }
 }
 
+/* in intern.h */
 int
 rb_sourceline(void)
 {