Merge {Abort} into {AbortCompilation}.

R=ahaas@chromium.org

Bug: v8:8689
Change-Id: I091a298b1195d145fc21d2afb9d9cc9c57925f95
Reviewed-on: https://chromium-review.googlesource.com/c/1451821
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59346}