dart2js: Initial implementation of inlining.

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

Index: pkg/compiler/lib/src/cps_ir/cps_fragment.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_fragment.dart b/pkg/compiler/lib/src/cps_ir/cps_fragment.dart
index 57c9647e15f5b7164bb7aaf2e80bfb3b1c039b82..a4bd305f9f58737621f6ce1d5a4ad933d708a2a1 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_fragment.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_fragment.dart
@@ -130,11 +130,14 @@ class CpsFragment {
 
   /// Inserts an invocation and returns a primitive holding the returned value.
   Primitive invokeMethod(Primitive receiver,
-                         Selector selector,
-                         TypeMask mask,
-                         List<Primitive> arguments) {
-    return letPrim(new InvokeMethod(receiver, selector, mask, arguments,
-        sourceInformation));
+      Selector selector,
+      TypeMask mask,
+      List<Primitive> arguments,
+      [CallingConvention callingConvention = CallingConvention.Normal]) {
+    InvokeMethod invoke =
+        new InvokeMethod(receiver, selector, mask, arguments, sourceInformation)
+            ..callingConvention = callingConvention;
+    return letPrim(invoke);
   }
 
   /// Inserts an invocation and returns a primitive holding the returned value.