This patch adds the two TypedArray methods indexOf and lastIndexOf,
which are similar to the methods on Arrays. Tests are ported from
arrays as well.

BUG=v8:3578
LOG=Y
R=arv@chromium.org

Review URL: https://codereview.chromium.org/1141763004

Patch from Daniel Ehrenberg <dehrenberg@chromium.org>.

Cr-Commit-Position: refs/heads/master@{#28495}