Inline object constructor already in the method recognizer.

runtime/vm/flow_graph_optimizer.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 2454 matching lines @@
                                       call->deopt_id());
     ReplaceCall(call, con);
   } else if (recognized_kind == MethodRecognizer::kUint32x4BoolConstructor) {
     Uint32x4BoolConstructorInstr* con = new Uint32x4BoolConstructorInstr(
         new Value(call->ArgumentAt(1)),
         new Value(call->ArgumentAt(2)),
         new Value(call->ArgumentAt(3)),
         new Value(call->ArgumentAt(4)),
         call->deopt_id());
     ReplaceCall(call, con);
+  } else if (recognized_kind == MethodRecognizer::kObjectConstructor) {
+    // Remove the original push arguments.
+    for (intptr_t i = 0; i < call->ArgumentCount(); ++i) {
+      PushArgumentInstr* push = call->PushArgumentAt(i);
+      push->ReplaceUsesWith(push->value()->definition());
+      push->RemoveFromGraph();
+    }
+    // Manually replace call with global null constant. ReplaceCall can't
+    // be used for definitions that are already in the graph.
+    call->ReplaceUsesWith(flow_graph_->constant_null());
+    ASSERT(current_iterator()->Current() == call);
+    current_iterator()->RemoveCurrentFromGraph();;
   }
 }
 
 
 bool FlowGraphOptimizer::TryInlineInstanceSetter(InstanceCallInstr* instr,
                                                  const ICData& unary_ic_data) {
   ASSERT((unary_ic_data.NumberOfChecks() > 0) &&
       (unary_ic_data.num_args_tested() == 1));
   if (FLAG_enable_type_checks) {
     // TODO(srdjan): Add assignable check node if --enable_type_checks.
@@ skipping 4099 matching lines @@
 
   // Insert materializations at environment uses.
   const Class& cls = Class::Handle(alloc->constructor().Owner());
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, cls, *fields);
   }
 }
 
 
 }  // namespace dart