Disable allocation sinking in the presence of try-catch.

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
@@ skipping 432 matching lines @@
       TryCatchAnalyzer::Optimize(flow_graph);
 
       // Detach environments from the instructions that can't deoptimize.
       // Do it before we attempt to perform allocation sinking to minimize
       // amount of materializations it has to perform.
       optimizer.EliminateEnvironments();
 
       // Attempt to sink allocations of temporary non-escaping objects to
       // the deoptimization path.
       AllocationSinking* sinking = NULL;
-      if (FLAG_allocation_sinking) {
+      if (FLAG_allocation_sinking &&
+          (flow_graph->graph_entry()->SuccessorCount()  == 1)) {
+        // TODO(fschneider): Support allocation sinking with try-catch.
         sinking = new AllocationSinking(flow_graph);
         sinking->Optimize();
       }
 
       // Ensure that all phis inserted by optimization passes have consistent
       // representations.
       optimizer.SelectRepresentations();
 
       if (optimizer.Canonicalize()) {
         // To fully remove redundant boxing (e.g. BoxDouble used only in
@@ skipping 415 matching lines @@
       Object::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart