Change core lib, dart2js, and more for new optional parameters syntax

lib/compiler/implementation/compile_time_constants.dart

Index: lib/compiler/implementation/compile_time_constants.dart
===================================================================
--- lib/compiler/implementation/compile_time_constants.dart	(revision 13496)
+++ lib/compiler/implementation/compile_time_constants.dart	(working copy)
@@ -75,7 +75,7 @@
    * Returns the a compile-time constant if the variable could be compiled
    * eagerly. Otherwise returns `null`.
    */
-  Constant compileVariable(VariableElement element, [bool isConst = false]) {
+  Constant compileVariable(VariableElement element, {bool isConst: false}) {
     return measure(() {
       if (initialVariableValues.containsKey(element)) {
         Constant result = initialVariableValues[element];
@@ -96,7 +96,7 @@
    */
   Constant compileVariableWithDefinitions(VariableElement element,
                                           TreeElements definitions,
-                                          [bool isConst = false]) {
+                                          {bool isConst: false}) {
     return measure(() {
       // Initializers for parameters must be const.
       isConst = isConst || element.modifiers.isConst()
@@ -156,11 +156,11 @@
 
   Constant compileNodeWithDefinitions(Node node,
                                       TreeElements definitions,
-                                      [bool isConst]) {
+                                      {bool isConst}) {
     return measure(() {
       assert(node !== null);
       CompileTimeConstantEvaluator evaluator = new CompileTimeConstantEvaluator(
-          constantSystem, definitions, compiler, isConst);
+          constantSystem, definitions, compiler, isConst: isConst);
       return evaluator.evaluate(node);
     });
   }
@@ -248,7 +248,7 @@
   CompileTimeConstantEvaluator(this.constantSystem,
                                this.elements,
                                this.compiler,
-                               [bool isConst])
+                               {bool isConst})
       : this.isEvaluatingConstant = isConst;
 
   Constant evaluate(Node node) {