Template specializations must use exact types to match.

Bug: chromium:1056170
Change-Id: I2278e9b40712fc209044fe565023029cc5ae3ff3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2474776
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70527}