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.cc b/compiler/optimizing/stack_map_stream.cc
index e87f3c8..c0e3206 100644
--- a/compiler/optimizing/stack_map_stream.cc
+++ b/compiler/optimizing/stack_map_stream.cc
@@ -57,7 +57,7 @@
 void StackMapStream::EndMethod(size_t code_size) {
   DCHECK(in_method_) << "Mismatched Begin/End calls";
   in_method_ = false;
-  packed_code_size_ = StackMap::PackNativePc(code_size, instruction_set_);
+  code_size_ = code_size;
 
   // Read the stack masks now. The compiler might have updated them.
   for (size_t i = 0; i < lazy_stack_masks_.size(); i++) {
@@ -68,8 +68,9 @@
     }
   }
 
+  uint32_t packed_code_size = StackMap::PackNativePc(code_size, instruction_set_);
   for (size_t i = 0; i < stack_maps_.size(); i++) {
-    DCHECK_LE(stack_maps_[i][StackMap::kPackedNativePc], packed_code_size_);
+    DCHECK_LE(stack_maps_[i][StackMap::kPackedNativePc], packed_code_size);
   }
 }
 
@@ -301,7 +302,7 @@
 
   ScopedArenaVector<uint8_t> buffer(allocator_->Adapter(kArenaAllocStackMapStream));
   BitMemoryWriter<ScopedArenaVector<uint8_t>> out(&buffer);
-  out.WriteVarint(packed_code_size_);
+  out.WriteVarint(code_size_);
   out.WriteVarint(packed_frame_size_);
   out.WriteVarint(core_spill_mask_);
   out.WriteVarint(fp_spill_mask_);