Remove support for optimized dart leaf functions.

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
===================================================================
--- runtime/vm/flow_graph_compiler.cc	(revision 13457)
+++ runtime/vm/flow_graph_compiler.cc	(working copy)
@@ -139,8 +139,7 @@
 
 FlowGraphCompiler::FlowGraphCompiler(Assembler* assembler,
                                      const FlowGraph& flow_graph,
-                                     bool is_optimizing,
-                                     bool is_leaf)
+                                     bool is_optimizing)
     : assembler_(assembler),
       parsed_function_(flow_graph.parsed_function()),
       block_order_(flow_graph.reverse_postorder()),
@@ -153,7 +152,6 @@
       deopt_infos_(),
       object_table_(GrowableObjectArray::Handle(GrowableObjectArray::New())),
       is_optimizing_(is_optimizing),
-      is_dart_leaf_(is_leaf),
       bool_true_(Bool::ZoneHandle(Bool::True())),
       bool_false_(Bool::ZoneHandle(Bool::False())),
       double_class_(Class::ZoneHandle(
@@ -173,13 +171,6 @@
 }
 
 
-bool FlowGraphCompiler::IsLeaf() const {
-  return is_dart_leaf_ &&
-         !parsed_function_.function().IsClosureFunction() &&
-         (parsed_function().num_copied_params() == 0);
-}
-
-
 bool FlowGraphCompiler::HasFinally() const {
   return parsed_function().function().has_finally();
 }
@@ -482,7 +473,6 @@
     const Array& argument_names,
     intptr_t checked_argument_count,
     LocationSummary* locs) {
-  ASSERT(!IsLeaf());
   ICData& ic_data =
       ICData::ZoneHandle(ICData::New(parsed_function().function(),
                                      function_name,