Port d6636145

Original Commit Message:

    Part of ongoing work to remove the construct_stub.

    For non-constructable functions, don't use the non-constructable stub,
    instead handle non-constructables explicitly in ConstructFunction.

R=petermarshall@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I2e81b03b8fbbde025881fd3b65fe2fa0604f6ff5
Reviewed-on: https://chromium-review.googlesource.com/981116
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52234}