Move resolving of natives to a late stage (during code emission). That eliminates unnecessary nativ…

runtime/vm/ast.h

Index: runtime/vm/ast.h
diff --git a/runtime/vm/ast.h b/runtime/vm/ast.h
index c3b6ac1f6f81bf532050930b232343988eda527a..14934fd3cefa0b997519cf20d379679f05e93a2e 100644
--- a/runtime/vm/ast.h
+++ b/runtime/vm/ast.h
@@ -1814,19 +1814,14 @@ class NativeBodyNode : public AstNode {
   NativeBodyNode(intptr_t token_pos,
                  const Function& function,
                  const String& native_c_function_name,
-                 NativeFunction native_c_function,
                  LocalScope* scope,
-                 bool is_bootstrap_native,
                  bool link_lazily = false)
       : AstNode(token_pos),
         function_(function),
         native_c_function_name_(native_c_function_name),
-        native_c_function_(native_c_function),
         scope_(scope),
-        is_bootstrap_native_(is_bootstrap_native),
         link_lazily_(link_lazily) {
     ASSERT(function_.IsZoneHandle());
-    ASSERT(native_c_function_ != NULL);
     ASSERT(native_c_function_name_.IsZoneHandle());
     ASSERT(native_c_function_name_.IsSymbol());
   }
@@ -1835,9 +1830,7 @@ class NativeBodyNode : public AstNode {
   const String& native_c_function_name() const {
     return native_c_function_name_;
   }
-  NativeFunction native_c_function() const { return native_c_function_; }
   LocalScope* scope() const { return scope_; }
-  bool is_bootstrap_native() const { return is_bootstrap_native_; }
 
   bool link_lazily() const { return link_lazily_; }
 
@@ -1848,9 +1841,7 @@ class NativeBodyNode : public AstNode {
  private:
   const Function& function_;  // Native Dart function.
   const String& native_c_function_name_;
-  NativeFunction native_c_function_;  // Actual non-Dart implementation.
   LocalScope* scope_;
-  const bool is_bootstrap_native_;  // Is a bootstrap native method.
   const bool link_lazily_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(NativeBodyNode);