Add an explicit push-argument instruction to the IL.

vm/il_printer.cc

Index: vm/il_printer.cc
===================================================================
--- vm/il_printer.cc	(revision 9930)
+++ vm/il_printer.cc	(working copy)
@@ -152,8 +152,8 @@
 
 void ClosureCallComp::PrintOperandsTo(BufferFormatter* f) const {
   for (intptr_t i = 0; i < ArgumentCount(); ++i) {
-    if (i == 0) f->Print(", ");
-    ArgumentAt(i)->PrintTo(f);
+    if (i > 0) f->Print(", ");
+    f->Print("cid%d", ArgumentAt(i)->cid());
   }
 }
 
@@ -295,10 +295,6 @@
 
 void CreateClosureComp::PrintOperandsTo(BufferFormatter* f) const {
   f->Print("%s", function().ToCString());
-  f->Print(", ");
-  type_arguments()->PrintTo(f);
-  f->Print(", ");
-  receiver()->PrintTo(f);
 }
 
 
@@ -422,6 +418,12 @@
 }
 
 
+void PushArgumentInstr::PrintTo(BufferFormatter* f) const {
+  f->Print("    %s:%d ", DebugName(), cid());
+  value()->PrintTo(f);
+}
+
+
 void ReturnInstr::PrintTo(BufferFormatter* f) const {
   f->Print("    %s ", DebugName());
   value()->PrintTo(f);
@@ -680,6 +682,12 @@
 }
 
 
+void PushArgumentInstr::PrintToVisualizer(BufferFormatter* f) const {
+  f->Print("_ %s:%d ", DebugName(), cid());
+  value()->PrintTo(f);
+}
+
+
 void ReturnInstr::PrintToVisualizer(BufferFormatter* f) const {
   f->Print("_ %s ", DebugName());
   value()->PrintTo(f);