Optimize functions containing 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 277 matching lines @@
 
       // The final canonicalization pass before the code generation.
       if (FLAG_propagate_types) {
         // Recompute types after code movement was done to ensure correct
         // reaching types for hoisted values.
         FlowGraphTypePropagator propagator(flow_graph);
         propagator.Propagate();
         DEBUG_ASSERT(flow_graph->VerifyUseLists());
       }
 
+      // Optimize try-blocks.
+      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) {
         sinking = new AllocationSinking(flow_graph);
@@ skipping 425 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