Inline indexed load and store of typed array float64.

runtime/vm/flow_graph_compiler_x64.h

Index: runtime/vm/flow_graph_compiler_x64.h
===================================================================
--- runtime/vm/flow_graph_compiler_x64.h	(revision 13622)
+++ runtime/vm/flow_graph_compiler_x64.h	(working copy)
@@ -210,6 +210,14 @@
 
   static bool EvaluateCondition(Condition condition, intptr_t l, intptr_t r);
 
+  // Array/list element address computations.
+  static FieldAddress ElementAddressForIntIndex(intptr_t cid,
+                                                Register array,
+                                                intptr_t offset);
+  static FieldAddress ElementAddressForRegIndex(intptr_t cid,
+                                                Register array,
+                                                Register index);
+
  private:
   void GenerateDeferredCode();