Adds support for collecting statistics about code and its metadata.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 3cbf5915a7569bf8b56eacd607981d13ff047ea3..4ec6164dd5baa5344020f3715a93fe3fe1bfcd4a 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4020,6 +4020,13 @@ Address BytecodeArray::GetFirstBytecodeAddress() {
 
 int BytecodeArray::BytecodeArraySize() { return SizeFor(this->length()); }
 
+int BytecodeArray::SizeIncludingMetadata() {
+  int size = BytecodeArraySize();
+  size += constant_pool()->Size();
+  size += handler_table()->Size();
+  size += source_position_table()->Size();
+  return size;
+}
 
 ACCESSORS(FixedTypedArrayBase, base_pointer, Object, kBasePointerOffset)
 
@@ -5198,6 +5205,13 @@ int AbstractCode::instruction_size() {
   }
 }
 
+int AbstractCode::SizeIncludingMetadata() {
+  if (IsCode()) {
+    return GetCode()->SizeIncludingMetadata();
+  } else {
+    return GetBytecodeArray()->SizeIncludingMetadata();
+  }
+}
 int AbstractCode::ExecutableSize() {
   if (IsCode()) {
     return GetCode()->ExecutableSize();
@@ -6427,6 +6441,13 @@ int Code::body_size() {
   return RoundUp(instruction_size(), kObjectAlignment);
 }
 
+int Code::SizeIncludingMetadata() {
+  int size = CodeSize();
+  size += relocation_info()->Size();
+  size += deoptimization_data()->Size();
+  size += handler_table()->Size();
+  return size;
+}
 
 ByteArray* Code::unchecked_relocation_info() {
   return reinterpret_cast<ByteArray*>(READ_FIELD(this, kRelocationInfoOffset));