Add support for startup data (snapshot) compression.

src/snapshot-empty.cc

Index: src/snapshot-empty.cc
diff --git a/src/snapshot-empty.cc b/src/snapshot-empty.cc
index cb26eb8c528aaf1a90a8a6499a5f060d2afe80e8..0b35720ccea9ff5fd53fb0896085bbaa7e6a0dbc 100644
--- a/src/snapshot-empty.cc
+++ b/src/snapshot-empty.cc
@@ -35,9 +35,13 @@ namespace v8 {
 namespace internal {
 
 const byte Snapshot::data_[] = { 0 };
+const byte* Snapshot::raw_data_ = NULL;
 const int Snapshot::size_ = 0;
+const int Snapshot::raw_size_ = 0;
 const byte Snapshot::context_data_[] = { 0 };
+const byte* Snapshot::context_raw_data_ = NULL;
 const int Snapshot::context_size_ = 0;
+const int Snapshot::context_raw_size_ = 0;
 
 const int Snapshot::new_space_used_ = 0;
 const int Snapshot::pointer_space_used_ = 0;