1730 DTrace should ignore type information from modules with cth_parlabel mismatches
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>

@@ -978,10 +978,20 @@
 {
         return (fp->ctf_parname);
 }
 
 /*
+ * Return the label of the parent CTF container, if one exists.  Otherwise
+ * return NULL.
+ */
+const char *
+ctf_parent_label(ctf_file_t *fp)
+{
+        return (fp->ctf_parlabel);
+}
+
+/*
  * Import the types from the specified parent container by storing a pointer
  * to it in ctf_parent and incrementing its reference count.  Only one parent
  * is allowed: if a parent already exists, it is replaced by the new parent.
  */
 int