Expand ResolvedAst to handle synthetic constructors.

pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
index e9d184537a00b13cbc03b1fe5f58118f5d0b10e2..54cb1adc8d129bca3d8ae559d32498a38e822111 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
@@ -193,7 +193,7 @@ class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
   /// one currently being built.
   ClosureScope getClosureScopeForFunction(FunctionElement function) {
     closure.ClosureClassMap map = compiler.closureToClassMapper
-        .computeClosureToClassMapping(function, function.node, elements);
+        .computeClosureToClassMapping(function.resolvedAst);
     return new ClosureScope(map.capturingScopes[function.node]);
   }
 
@@ -714,7 +714,7 @@ class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
     ConstructorElement constructor = body.constructor;
     ast.FunctionExpression node = constructor.node;
     closureClassMap = compiler.closureToClassMapper
-        .computeClosureToClassMapping(constructor, node, elements);
+        .computeClosureToClassMapping(constructor.resolvedAst);
 
     // We compute variables boxed in mutable variables on entry to each try
     // block, not including variables captured by a closure (which are boxed
@@ -745,7 +745,7 @@ class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
     assert(elements[node] != null);
 
     closureClassMap = compiler.closureToClassMapper
-        .computeClosureToClassMapping(element, node, elements);
+        .computeClosureToClassMapping(element.resolvedAst);
     TryBoxedVariables variables = _analyzeTryBoxedVariables(node);
     tryStatements = variables.tryStatements;
     IrBuilder builder = getBuilderFor(element);
@@ -758,7 +758,7 @@ class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
       return null; // Nothing to do.
     }
     closureClassMap = compiler.closureToClassMapper
-        .computeClosureToClassMapping(element, element.node, elements);
+        .computeClosureToClassMapping(element.resolvedAst);
     IrBuilder builder = getBuilderFor(element);
     return withBuilder(builder, () {
       irBuilder.buildFunctionHeader(<Local>[]);