It's not necessary to set the qualifier on folded nodes separately,
they always use the qualifier of the node being folded.

BUG=angleproject:1490
TEST=angle_unittests

Change-Id: Id2581ef4cae42d7137fbe0caf18c3fcacbf954c6
Reviewed-on: https://chromium-review.googlesource.com/847553
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>