Long chains of recursive swizzling could previously cause a stack
overflow in checkCanBeLValue. Fold recursive swizzling when it is
parsed to prevent this.

BUG=angleproject:2439
TEST=angle_unittests

Change-Id: I83b4c27442185709f6762d5ec23b93244010da05
Reviewed-on: https://chromium-review.googlesource.com/983593Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>