Add source information to variable declarations in CPS.

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

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
index 61a5ddd961408f55925d59b7b72f0c03c72b194b..8c44f4d886388f7951e09046d594c753dec1ca36 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
@@ -419,10 +419,16 @@ class FunctionDefinition extends InteriorNode {
   final Parameter thisParameter;
   final List<Parameter> parameters;
   final Continuation returnContinuation;
+  final SourceInformation sourceInformation;
   Expression body;
 
-  FunctionDefinition(this.element, this.thisParameter, this.parameters,
-      this.returnContinuation, this.body);
+  FunctionDefinition(
+      this.element,
+      this.thisParameter,
+      this.parameters,
+      this.returnContinuation,
+      this.body,
+      {this.sourceInformation});
 
   accept(BlockVisitor visitor) => visitor.visitFunctionDefinition(this);
 
@@ -3022,7 +3028,8 @@ class CopyingVisitor extends TrampolineRecursiveVisitor {
 
     visit(node.body);
     FunctionDefinition copy = new FunctionDefinition(
-        node.element, thisParameter, parameters, returnContinuation, _first);
+        node.element, thisParameter, parameters, returnContinuation, _first,
+        sourceInformation: node.sourceInformation);
     _first = _current = null;
     return copy;
   }