The stack-memory traversal is prone to stack overflow. See the
WebGL conformance test long-expressions-should-not-crash.

BUG=angle:584

Change-Id: I02d72bc2e4101b7141d609c50303403ea8298e60
Reviewed-on: https://chromium-review.googlesource.com/191034Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>