Support large objects in the serializer/deserializer.

src/snapshot-source-sink.cc

Index: src/snapshot-source-sink.cc
diff --git a/src/snapshot-source-sink.cc b/src/snapshot-source-sink.cc
index 44f87060fc98f478926fe5a15f9130c1d56cdbca..29bad33aac0b4c813aa9899a3fdf7bb25f865fc0 100644
--- a/src/snapshot-source-sink.cc
+++ b/src/snapshot-source-sink.cc
@@ -39,15 +39,17 @@ void SnapshotByteSource::CopyRaw(byte* to, int number_of_bytes) {
 
 
 void SnapshotByteSink::PutInt(uintptr_t integer, const char* description) {
-  DCHECK(integer < 1 << 22);
+  DCHECK(integer < 1 << 30);
   integer <<= 2;
   int bytes = 1;
   if (integer > 0xff) bytes = 2;
   if (integer > 0xffff) bytes = 3;
-  integer |= bytes;
+  if (integer > 0xffffff) bytes = 4;
+  integer |= (bytes - 1);
   Put(static_cast<int>(integer & 0xff), "IntPart1");
   if (bytes > 1) Put(static_cast<int>((integer >> 8) & 0xff), "IntPart2");
   if (bytes > 2) Put(static_cast<int>((integer >> 16) & 0xff), "IntPart3");
+  if (bytes > 3) Put(static_cast<int>((integer >> 24) & 0xff), "IntPart4");
 }
 
 void SnapshotByteSink::PutRaw(byte* data, int number_of_bytes,