tree 5a64294543ccf4e9144220bc58129545fc95c7c2
parent fb873ce75c50aa671d6fdc8a0b0e9b3c5bd70581
author Todd Wang <toddw@google.com> 1461316300 -0700
committer Todd Wang <toddw@google.com> 1461316300 -0700

Add VDLIsZero, and use it in VDLWrite.

This CL adds the VDLIsZero method, which is used to check whether
the method receiver is the VDL zero value.  This is used in
codegen to make zero struct field checking both simpler and faster.

Also simplified both VDLRead and VDLWrite codegen, to make things
more consistent and easier to understand.

MultiPart: 2/5
Change-Id: I592c9f1bff4ecbe198d9d842e8c7cc3aafad36fd