Minor, annotate the added tables with likely/unlikely (#997)

diff --git a/src/hb-aat-layout-ankr-table.hh b/src/hb-aat-layout-ankr-table.hh
index dc6582b..3b7912b 100644
--- a/src/hb-aat-layout-ankr-table.hh
+++ b/src/hb-aat-layout-ankr-table.hh
@@ -58,9 +58,10 @@
   inline bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);
-    return_trace (c->check_struct (this) && version == 0 &&
-		  lookupTable.sanitize (c, this) &&
-		  anchors.sanitize (c, this));
+    return_trace (likely (c->check_struct (this) &&
+			  version == 0 &&
+			  lookupTable.sanitize (c, this) &&
+			  anchors.sanitize (c, this)));
   }
 
   protected: