[vala] (6 commits) Non-fast-forward update to branch wip/array-length-type

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/array-length-type' 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:

  2283510... vala: Add ArrayType.length_type and ArrayCreationExpression
  c070949... codegen: Remove hardcoded "int" length type and use ArrayTy
  3b5d57b... gdbus: Remove hardcoded "int" length type and use ArrayType
  39e9231... codegen: Support marshalling ArrayType.length_type in signa
  ec232b6... codegen: Keep respecting CCode array_length_type of Paramet

Commits added to the branch:

  b850937... vala: Drop DataType.is_array() and use usual type check as  (*)
  7e303f4... vala: Add ArrayType.length_type and ArrayCreationExpression
  77df5aa... codegen: Remove hardcoded "int" length type and use ArrayTy
  a07a7d3... gdbus: Remove hardcoded "int" length type and use ArrayType
  0df7e19... codegen: Support marshalling ArrayType.length_type in signa
  2627b59... codegen: Keep respecting CCode array_length_type of Paramet

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