[gjs] (12 commits) ...Merge branch 'wip/gcampax/70-arg-cache' into 'master'

[Philip Chimento <pchimento src gnome org>]

Summary of changes:

  7cf9350... function: introduce a new system for better caching of mars (*)
  959b4f9... arg-cache: make actual use of the argument cache (*)
  10e234b... arg-cache: be more fine-grained in the argument cache (*)
  1f3984c... arg-cache: extend to handle interface types too (*)
  cb86657... function: use the argument cache for the instance parameter (*)
  5e76857... arg-cache: Improve struct packing and add sizeof guard (*)
  dce7e22... arg-cache: Factor out code for handling null pointers (*)
  08a56d5... arg-cache: Limit GI arguments to 253 and use 8-bit storage (*)
  8b2927b... arg-cache: Save space in enum bounds (*)
  adfb7dc... arg-cache: Save space by not caching GType (*)
  1bdc542... arg-cache: Store marshallers in predefined groups (*)
  017b562... Merge branch 'wip/gcampax/70-arg-cache' into 'master'

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