VM: Add smi fast path operations for precompiled code

runtime/vm/stack_frame.cc

Index: runtime/vm/stack_frame.cc
diff --git a/runtime/vm/stack_frame.cc b/runtime/vm/stack_frame.cc
index fb3d8d858cc0358169d7f1746ad3bcff87891e0d..d7016728a836155e6159693b78129aa12eea94f6 100644
--- a/runtime/vm/stack_frame.cc
+++ b/runtime/vm/stack_frame.cc
@@ -112,16 +112,12 @@ void StackFrame::VisitObjectPointers(ObjectPointerVisitor* visitor) {
       // visit frame slots which are marked as having objects.
       //
       // The layout of the frame is (lower addresses to the right):
-      // | spill slots | outgoing arguments | saved registers |
-      // |XXXXXXXXXXXXX|--------------------|XXXXXXXXXXXXXXXXX|
+      // | spill slots | outgoing arguments | saved registers | slow-path args |
+      // |XXXXXXXXXXXXX|--------------------|XXXXXXXXXXXXXXXXX|XXXXXXXXXXXXXXXX|
       //
       // The spill slots and any saved registers are described in the stack
       // map.  The outgoing arguments are assumed to be tagged; the number
       // of outgoing arguments is not explicitly tracked.
-      //
-      // TODO(kmillikin): This does not handle slow path calls with

[Vyacheslav Egorov (Google), 2016/03/04 13:30:36]

Hooray! 

-      // arguments, where the arguments are pushed after the live registers.
-      // Enable such calls.
       intptr_t length = map.Length();
       // Spill slots are at the 'bottom' of the frame.
       intptr_t spill_slot_count = length - map.RegisterBitCount();