Some of the benchmarks were pointing to the wrong test functions.

Bug: 
Change-Id: I6f7850feec1da61bea7b8c1ac03c00d75400f458
Reviewed-on: https://chromium-review.googlesource.com/574023Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
Cr-Commit-Position: refs/heads/master@{#46701}

Bug: v8:4280
Change-Id: Iedd3182301ad6cde4e63c65dca6cd280e3f05198
Reviewed-on: https://chromium-review.googlesource.com/524044Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45707}