Avoid redundant assertion code in equality comparisons in checked mode.

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
===================================================================
--- runtime/vm/flow_graph_builder.cc	(revision 29815)
+++ runtime/vm/flow_graph_builder.cc	(working copy)
@@ -1440,12 +1440,11 @@
                               Object::null_array(),
                               2,
                               owner()->ic_data_array());
-    if (FLAG_enable_type_checks) {
-      Value* value = Bind(result);
-      result = new AssertBooleanInstr(node->token_pos(), value);
-    }
-
     if (node->kind() == Token::kNE) {
+      if (FLAG_enable_type_checks) {
+        Value* value = Bind(result);
+        result = new AssertBooleanInstr(node->token_pos(), value);
+      }
       Value* value = Bind(result);
       result = new BooleanNegateInstr(value);
     }