Don't pack code size in CodeInfo.

The unpacking is tricky for host tooling as we need to propagate ISA.

This adds 0.05% to oat file size.

Bug: 123510633
Change-Id: I5618db5e5dbe83d8a2bb89aef61cb0b10e336f40
diff --git a/compiler/optimizing/stack_map_stream.h b/compiler/optimizing/stack_map_stream.h
index 164e902..1fea3ef 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 packed_code_size_ = 0;
+  uint32_t code_size_ = 0;
   uint32_t packed_frame_size_ = 0;
   uint32_t core_spill_mask_ = 0;
   uint32_t fp_spill_mask_ = 0;