Fix crash with --noopt and no_snapshot: initialize megamorphic cache table before first code is run.

runtime/vm/dart.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ skipping 281 matching lines @@
     // Populate the isolate's symbol table with all symbols from the
     // VM isolate. We do this so that when we generate a full snapshot
     // for the isolate we have a unified symbol table that we can then
     // read into the VM isolate.
     Symbols::AddPredefinedSymbolsToIsolate();
   }
 
   Object::VerifyBuiltinVtables();
 
   StubCode::Init(isolate);
+  isolate->megamorphic_cache_table()->InitMissHandler();
   if (snapshot_buffer == NULL) {
     if (!isolate->object_store()->PreallocateObjects()) {
       return isolate->object_store()->sticky_error();
     }
   }
-  isolate->megamorphic_cache_table()->InitMissHandler();
 
   isolate->heap()->EnableGrowthControl();
   isolate->set_init_callback_data(data);
   Api::SetupAcquiredError(isolate);
   if (FLAG_print_class_table) {
     isolate->class_table()->Print();
   }
 
   ServiceIsolate::MaybeInjectVMServiceLibrary(isolate);
 
@@ skipping 41 matching lines @@
   return predefined_handles_->handles_.AllocateScopedHandle();
 }
 
 
 bool Dart::IsReadOnlyHandle(uword address) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 }  // namespace dart