This is purely a renaming change. The ES spec uses the term 'detach'
for the process of removing the backing store of a typed array, while
V8 uses the historical term 'neuter'. Update our internal implementation,
including method names and flag names, to match the spec.

Note that some error messages still use the term 'neuter' since error
messages are asserted by some embedder tests, like layout tests.

R=bmeurer@chromium.org, yangguo@chromium.org, mstarzinger@chromium.org, mlippautz@chromium.org
BUG=chromium:913887

Change-Id: I62f1c3ac9ae67ba01d612a5221afa3d92deae272
Reviewed-on: https://chromium-review.googlesource.com/c/1370036
Commit-Queue: Ben Titzer <titzer@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58149}