Check that Dart_CreateIsolate is given a correct kind of snapshot.

runtime/vm/snapshot.cc

 // Copyright (c) 2012, 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/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
@@ skipping 114 matching lines @@
     return kBoolType;
   } else if (raw_type == object_store->string_type()) {
     return kStringType;
   } else if (raw_type == object_store->array_type()) {
     return kArrayType;
   }
   return kInvalidIndex;
 }
 
 
+const char* Snapshot::KindToCString(Kind kind) {
+  switch (kind) {
+    case kCore: return "core";
+    case kScript: return "script";
+    case kMessage: return "message";
+    case kAppWithJIT: return "app-jit";
+    case kAppNoJIT: return "app-aot";
+    case kNone: return "none";
+    case kInvalid:
+    default:
+      return "invalid";
+  }
+}
+
+
 // TODO(5411462): Temporary setup of snapshot for testing purposes,
 // the actual creation of a snapshot maybe done differently.
 const Snapshot* Snapshot::SetupFromBuffer(const void* raw_memory) {
   ASSERT(raw_memory != NULL);
   ASSERT(kHeaderSize == sizeof(Snapshot));
   ASSERT(kLengthIndex == length_offset());
   ASSERT((kSnapshotFlagIndex * sizeof(int64_t)) == kind_offset());
   ASSERT((kHeapObjectTag & kInlined));
   const Snapshot* snapshot = reinterpret_cast<const Snapshot*>(raw_memory);
   // If the raw length is negative or greater than what the local machine can
@@ skipping 1811 matching lines @@
   if (setjmp(*jump.Set()) == 0) {
     NoSafepointScope no_safepoint;
     WriteObject(obj.raw());
   } else {
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart