Shrink AOT snapshot size and memory usage.

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
diff --git a/runtime/vm/raw_object_snapshot.cc b/runtime/vm/raw_object_snapshot.cc
index 39d377a8b8184a526dcb9046e69c8398102033af..02ba16069b16eb11cef6e9231afc839c6bf6aac2 100644
--- a/runtime/vm/raw_object_snapshot.cc
+++ b/runtime/vm/raw_object_snapshot.cc
@@ -764,11 +764,14 @@ void RawFunction::WriteTo(SnapshotWriter* writer,
     bool is_optimized = Code::IsOptimized(ptr()->code_);
 
     // Write out all the non object fields.
+#if !defined(DART_PRECOMPILED_RUNTIME)

[Florian Schneider, 2016/09/15 17:17:37]

In a separate CL, it may be worth excluding the writer code not used for
messages in precompiled runtime like you did for the clustered writer.

[rmacnak, 2016/09/16 21:59:02]

Acknowledged.

     writer->Write<int32_t>(ptr()->token_pos_.SnapshotEncode());
     writer->Write<int32_t>(ptr()->end_token_pos_.SnapshotEncode());
+#endif
     writer->Write<int16_t>(ptr()->num_fixed_parameters_);
     writer->Write<int16_t>(ptr()->num_optional_parameters_);
     writer->Write<uint32_t>(ptr()->kind_tag_);
+#if !defined(DART_PRECOMPILED_RUNTIME)
     if (is_optimized) {
       writer->Write<int32_t>(FLAG_optimization_counter_threshold);
     } else {
@@ -777,6 +780,7 @@ void RawFunction::WriteTo(SnapshotWriter* writer,
     writer->Write<int8_t>(ptr()->deoptimization_counter_);
     writer->Write<uint16_t>(ptr()->optimized_instruction_count_);
     writer->Write<uint16_t>(ptr()->optimized_call_site_count_);
+#endif
 
     // Write out all the object pointer fields.
     SnapshotWriterVisitor visitor(writer, kAsReference);
@@ -1542,7 +1546,7 @@ RawICData* ICData::ReadFrom(SnapshotReader* reader,
   ICData& result = ICData::ZoneHandle(reader->zone(), ICData::New());
   reader->AddBackRef(object_id, &result, kIsDeserialized);
 
-  result.set_deopt_id(reader->Read<int32_t>());
+  NOT_IN_PRECOMPILED(result.set_deopt_id(reader->Read<int32_t>()));
   result.set_state_bits(reader->Read<uint32_t>());
 #if defined(TAG_IC_DATA)
   result.set_tag(reader->Read<int16_t>());
@@ -1572,7 +1576,7 @@ void RawICData::WriteTo(SnapshotWriter* writer,
   writer->WriteTags(writer->GetObjectTags(this));
 
   // Write out all the non object fields.
-  writer->Write<int32_t>(ptr()->deopt_id_);
+  NOT_IN_PRECOMPILED(writer->Write<int32_t>(ptr()->deopt_id_));
   writer->Write<uint32_t>(ptr()->state_bits_);
 #if defined(TAG_IC_DATA)
   writer->Write<int16_t>(ptr()->tag_);