This is a performance experiment. We will revert it if it causes
regressions.
The idea is that many map transitions are only performed once; but if
they are done by a non-UNINITIALIZED StoreIC, we would always create
a handler for them. With this CL, handler creation is postponed until
the second time a given transition is done. The first time, the IC
simply remains in its previous state.

Change-Id: I0fb2989bb675a09ed7b329520346048ad2049f94
Reviewed-on: https://chromium-review.googlesource.com/622147Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47483}