Reviewers: Benedikt Meurer,

Message:
Hi Benedikt, here is the change we discussed. Thanks for the suggestion on
regularity of the array, I've addressed that.
--Michael


Description:
Vector ICs: Make the Oracle gather feedback for vector stores.

Also, polymorphic element stores have a slightly different shape for the array attached to a vector slot. It's of the form [map, map, handler], where the 2nd
map is either a transition map or undefined. (the maps are actually in
WeakCells).

BUG=

Please review this at https://codereview.chromium.org/1316953003/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+169, -24 lines):
  M src/type-feedback-vector.h
  M src/type-feedback-vector.cc
  M src/type-info.h
  M src/type-info.cc
  M src/typing.cc


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