Last snapshot bits to get working precompiled hello_world on x64.

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index a0f8584168dfbe011c6d4cb3eb835c5d8fb3d1f3..f94ff5d8a469f8bcda8c496d717537b705c818e8 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -141,6 +141,9 @@ const char* Dart::InitOnce(const uint8_t* vm_isolate_snapshot,
     // Now that the needed stub has been generated, set the stack limit.
     vm_isolate_->InitializeStackLimit();
     if (vm_isolate_snapshot != NULL) {
+      if (instructions_snapshot != NULL) {
+        vm_isolate_->SetupInstructionsSnapshotPage(instructions_snapshot);
+      }
       const Snapshot* snapshot = Snapshot::SetupFromBuffer(vm_isolate_snapshot);
       if (snapshot == NULL) {
         return "Invalid vm isolate snapshot seen.";
@@ -305,13 +308,18 @@ RawError* Dart::InitializeIsolate(const uint8_t* snapshot_buffer, void* data) {
   }
 
   Object::VerifyBuiltinVtables();
+#if defined(DEBUG)
+  I->heap()->Verify(kForbidMarked);
+#endif
 
   {
     TimelineDurationScope tds(I, I->GetIsolateStream(), "StubCode::Init");
     StubCode::Init(I);
   }
 
-  I->megamorphic_cache_table()->InitMissHandler();
+  if (Object::instructions_snapshot_buffer() == NULL) {

[siva, 2015/09/14 21:29:33]

maybe we should have a readable accessor, something like

Dart::IsRunningPrecompiledCode()

[rmacnak, 2015/09/15 20:07:45]

Done.

+    I->megamorphic_cache_table()->InitMissHandler();
+  }
   if (snapshot_buffer == NULL) {
     if (!I->object_store()->PreallocateObjects()) {
       return I->object_store()->sticky_error();