AST pretty printer fix.

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index bc29920df885230d6a40c79103a9bdcc972d8046..4764918849dfe2aa6097dac6df94dea07edb5c74 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -232,12 +232,6 @@ class AstNode: public ZoneObject {
                                          FeedbackVectorSpec* spec,
                                          ICSlotCache* cache) {}
 
-  // Each ICSlot stores a kind of IC which the participating node should know.
-  virtual FeedbackVectorSlotKind FeedbackICSlotKind(int index) {
-    UNREACHABLE();
-    return FeedbackVectorSlotKind::UNUSED;
-  }
-
  private:
   // Hidden to prevent accidental usage. It would have to load the
   // current zone from the TLS.