Previously, we requested instantiation of generics prior to selecting
a template overload, which resulted in unused templates being
instantiated, possibly triggering unnecessary compile errors.

Bug: v8:7793
Change-Id: I45f4bdbf8aa93749ece416c6c7458d64e6e051f5
Reviewed-on: https://chromium-review.googlesource.com/1154977
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54950}