This allows us to use this flag to specify the local location of a
shared library when processing a trace run on Android.

Change-Id: I3aa44beaed700b8c5354af12a4df176aa1cbfd0c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1681137
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62448}