This brings us closer to our goal of deprecating the `construct_stub`
field in `SharedFunctionInfo`.

Bug: v8:7503
Change-Id: Id7bee0d61830f7bcf2cad4f6e50ff9f24b58a51b
Reviewed-on: https://chromium-review.googlesource.com/939790Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51633}