Hi,
this is leftover from the known type jump function removal.  Comitted as 
obvious.
        * ipa-prop.h (ipa_known_type_data): Remove.
        (ipa_binfo_from_known_type_jfunc): Remove.
Index: ipa-prop.h
===================================================================
--- ipa-prop.h  (revision 217589)
+++ ipa-prop.h  (working copy)
@@ -64,17 +64,6 @@
   IPA_JF_ANCESTOR          /* represented by field ancestor */
 };
 
-/* Structure holding data required to describe a known type jump function.  */
-struct GTY(()) ipa_known_type_data
-{
-  /* Offset of the component of the base_type being described.  */
-  HOST_WIDE_INT offset;
-  /* Type of the whole object.  */
-  tree base_type;
-  /* Type of the component of the object that is being described.  */
-  tree component_type;
-};
-
 struct ipa_cst_ref_desc;
 
 /* Structure holding data required to describe a constant jump function.  */
@@ -543,7 +532,6 @@
                                   vec<ipa_agg_jump_function_p> );
 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree,
                                                    bool speculative = false);
-tree ipa_binfo_from_known_type_jfunc (struct ipa_jump_func *);
 tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
 
 /* Functions related to both.  */

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