A couple of the builtins in src/js/typedarray.js still depends on these
intrinsics, so if we don't want to regress all of them, we'll have to
support these trivial intrinsics until the JS builtins are migrated.

R=yangguo@chromium.org
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2695553002
Cr-Commit-Position: refs/heads/master@{#43130}