Last snapshot bits to get working precompiled hello_world on x64.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 94daedff914a8dc03ff77e9f40f48b1a83153bcf..316b19485a2b8ec439b68e1c02e0cb7dbf53d732 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -494,6 +494,9 @@ class Object {
   static void set_instructions_snapshot_buffer(const uint8_t* buffer) {
     instructions_snapshot_buffer_ = buffer;
   }
+  static bool IsRunningPrecompiledCode() {
+    return instructions_snapshot_buffer != NULL;

[siva, 2015/09/15 23:22:01]

instructions_snapshot_buffer_

[rmacnak, 2015/09/16 01:34:44]

Done.

+  }

[siva, 2015/09/15 23:22:01]

We should move instructions_snapshot_buffer_ field to 'class Dart' so that the
code is more readable when using
Dart::IsRunningPrecompiledCode() instead of Object::IsRunningPrecompiledCode().

 
   static RawClass* class_class() { return class_class_; }
   static RawClass* dynamic_class() { return dynamic_class_; }
@@ -3772,6 +3775,7 @@ class Instructions : public Object {
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Instructions, Object);
   friend class Class;
   friend class Code;
+  friend class InstructionsWriter;
 };