Introduce a JSCreateArray operator that represents the Array
constructor, and lower call and construct calls to the Array
constructor to JSCreateArray. Currently we don't yet replace
that with an inline allocation, but always use the specialized
stubs for the Array constructor.

This saves a lot of unnecessary deopts and elements transitions
because now we can actually consume the allocation site feedback
for the transitions.

R=mstarzinger@chromium.org
BUG=v8:4470
LOG=n

Review URL: https://codereview.chromium.org/1466643002

Cr-Commit-Position: refs/heads/master@{#32145}