This moves the computation of the {expected_nof_properties} for a shared
function to where the object is actually being allocated. This is done
after parsing when the literal has been populated already. The expected
number of properties is not mutated after parsing.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1873173002

Cr-Commit-Position: refs/heads/master@{#35391}