Clean up creating constant folded nodes
Clean up creating constant folded nodes

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 <38ae6c0e2772a20e8e989f80cb8c99d274e44242@nvidia.com>
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle