Prepare for writing token streams directly into a snapshot and reading it directly from the snapsho…

vm/raw_object_snapshot.cc

Index: vm/raw_object_snapshot.cc
===================================================================
--- vm/raw_object_snapshot.cc	(revision 9070)
+++ vm/raw_object_snapshot.cc	(working copy)
@@ -1278,9 +1278,7 @@
   } else {
     writer->WriteIntptrValue(len - 2);
   }
-  for (intptr_t i = 2; i < len; i++) {
-    writer->Write<uint8_t>(str[i]);
-  }
+  writer->WriteBytes(reinterpret_cast<const uint8_t*>(&(str[2])), (len - 2));
 }
 
 
@@ -1488,8 +1486,14 @@
   writer->Write<RawObject*>(hash);
 
   // Write out the string.
-  for (intptr_t i = 0; i < len; i++) {
-    writer->Write(data[i]);
+  if (len > 0) {
+    if (class_id == ObjectStore::kOneByteStringClass) {
+      writer->WriteBytes(reinterpret_cast<const uint8_t*>(data), len);
+    } else {
+      for (intptr_t i = 0; i < len; i++) {
+        writer->Write(data[i]);
+      }
+    }
   }
 }