[bootstrapper] Ensure Map/Set constructor has fast properties.
Currently x instanceof Map/Set checks cannot take the fast path, since the Map/Set constructor has dictionary properties. To avoid that, just forcibly migrate the Map/Set constructor to fast properties again once it's fully setup in the bootstrapper. Bug: v8:5717, v8:5902 Change-Id: I23dfd00456c9206a0ca5af71dfbc9236982936fc Reviewed-on: https://chromium-review.googlesource.com/520578 Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Cr-Commit-Position: refs/heads/master@{#45663}
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