This CL re-uses pipeline naming for --trace-turbo phase naming.

Bug: v8:7327
Change-Id: I87efb01170ed5d3add7a79c9f38542e9cba6c493
Reviewed-on: https://chromium-review.googlesource.com/1064237
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53276}