[vala] (7 commits) Non-fast-forward update to branch wip/abi

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/abi' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  7d85bfc... compiler: Add --abi-stability option for future ABI stabili
  9b29fac... ccode: Allow adding of comments to a CCodeStruct
  340f0a0... codegen: Add public/private separator comments to type/inst
  f0c0ebb... codegen: Add "class_padding/instance_padding" CCode attribu
  c91eec4... tests: Add second pass with --abi-stability

Commits added to the branch:

  7700a0d... codegen: Factor-out generators for struct entries of class  (*)
  11897b4... compiler: Add --abi-stability option for future ABI stabili
  4ad3386... ccode: Allow adding of comments to a CCodeStruct
  5a2f5ef... codegen: Add public/private separator comments to type/inst
  0d700a1... codegen: Add "padding" CCode attributes for classes/interfa
  dae8649... tests: Add second pass with --abi-stability
  bcce332... codegen: Add abi-stability path for classes

(*) This commit already existed in another branch; no separate mail sent