Various little cleanups to avoid excessive allocation of handles.

runtime/vm/flow_graph_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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 558 matching lines @@
 void FlowGraphCompiler::EmitTestAndCall(const ICData& ic_data,
                                         Register class_id_reg,
                                         intptr_t arg_count,
                                         const Array& arg_names,
                                         Label* deopt,
                                         intptr_t deopt_id,
                                         intptr_t token_index,
                                         LocationSummary* locs) {
   ASSERT(!ic_data.IsNull() && (ic_data.NumberOfChecks() > 0));
   Label match_found;
-  for (intptr_t i = 0; i < ic_data.NumberOfChecks(); i++) {
-    const bool is_last_check = (i == (ic_data.NumberOfChecks() - 1));
+  const intptr_t len = ic_data.NumberOfChecks();
+  for (intptr_t i = 0; i < len; i++) {
+    const bool is_last_check = (i == (len - 1));
     Label next_test;
     assembler()->cmpl(class_id_reg, Immediate(ic_data.GetReceiverClassIdAt(i)));
     if (is_last_check) {
       assembler()->j(NOT_EQUAL, deopt);
     } else {
       assembler()->j(NOT_EQUAL, &next_test);
     }
     const Function& target = Function::ZoneHandle(ic_data.GetTargetAt(i));
     GenerateStaticCall(deopt_id,
                        token_index,
@@ skipping 326 matching lines @@
       ASSERT(Utils::IsInt(31, disp));
       return FieldAddress(array, disp);
     }
     default:
       UNIMPLEMENTED();
       return FieldAddress(SPREG, 0);
   }
 }
 
 }  // namespace dart