Revert "Don't pack code size in CodeInfo."

This reverts commit e35ac04a1a9a22b1c4386b27f3a30cd840aa17b1.

Bug: 123510633
Bug: 127305289

Reason for revert: b/127305289

Change-Id: I18c2d9291411b31641333c14c47da8c4fdf317f7
diff --git a/compiler/optimizing/stack_map_stream.h b/compiler/optimizing/stack_map_stream.h
index 1fea3ef..164e902 100644
--- a/compiler/optimizing/stack_map_stream.h
+++ b/compiler/optimizing/stack_map_stream.h
@@ -99,7 +99,7 @@
 
   ScopedArenaAllocator* allocator_;
   const InstructionSet instruction_set_;
-  uint32_t code_size_ = 0;
+  uint32_t packed_code_size_ = 0;
   uint32_t packed_frame_size_ = 0;
   uint32_t core_spill_mask_ = 0;
   uint32_t fp_spill_mask_ = 0;