Use simple loop tracking instead of size to determine if

lib/compiler/implementation/ssa/codegen.dart

 // 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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   final JavaScriptBackend backend;
   SsaCodeGeneratorTask(JavaScriptBackend backend)
       : this.backend = backend,
         super(backend.compiler);
   String get name() => 'SSA code generator';
@@ skipping 1589 matching lines @@
       int argumentCount = node.inputs.length - 1;
 
       // TODO(ahe): The constructor name was statically resolved in
       // SsaBuilder.buildFactory. Is there a cleaner way to do this?
       node.name.printOn(buffer);
       visitArguments(node.inputs);
     } else {
       buffer.add(compiler.namer.instanceMethodInvocationName(
           currentLibrary, node.name, node.selector));
       visitArguments(node.inputs);
+      bool inLoop = node.block.enclosingLoopHeader !== null;
       if (node.element !== null) {
         // If we know we're calling a specific method, register that
         // method only.
+        if (inLoop) {
+          backend.builder.functionsCalledInLoop.add(node.element);
+        }
         world.registerDynamicInvocationOf(node.element);
       } else {
+        if (inLoop) {
+          backend.builder.selectorsCalledInLoop[node.name] = node.selector;
+        }
         world.registerDynamicInvocation(
-            node.name, getOptimizedSelectorFor(node, node.selector));
+            node.name,
+            getOptimizedSelectorFor(node, node.selector));
       }
     }
     endExpression(JSPrecedence.CALL_PRECEDENCE);
   }
 
   Selector getOptimizedSelectorFor(HInvoke node, Selector defaultSelector) {
     Type receiverType = node.inputs[0].propagatedType.computeType(compiler);
     if (receiverType !== null) {
       return new TypedSelector(receiverType, defaultSelector);
     } else {
@@ skipping 1181 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endLabeledBlock(HLabeledBlockInformation labeledBlockInfo) {
     if (labeledBlockInfo.body.start.hasGuards()) {
       endBailoutSwitch();
     }
   }
 }