CodeStubAssembler::StrictEqual is modified to collect type feedback when
requested (https://chromium-review.googlesource.com/c/483399/). There 
are a couple of Gotos introduced in that cl, which are only necessary
when collecting type feedback. Changed it to generate these Gotos only
whencollecting type feedback.

Bug: v8:4280
Change-Id: I322a6065efcfb601bd9f5dc25be6e6bb00b2d1c0
Reviewed-on: https://chromium-review.googlesource.com/496268Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45135}