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This copies the following builder to chromium.memory:
https://ci.chromium.org/p/chromium/builders/ci/UBSanVptr%20Linux

And also renames it to conform to the lowercase, hyphenated builder
naming scheme.

The old builder's configs will be removed after the new builder is
up and running.

Bug: 1137496
Change-Id: Ie0bd99a377d63654261c6e9b484793120c84c30b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615132Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841179}