Fix nested struct scope support in GL backend.
Basically we should be able to reuse a struct name once the previous
use is out of the scope, or we can reuse it if we are in a inner scope
than where it is defined before.
BUG=368910
BUG=angle:618
TEST=conformance/glsl/bugs/nested-structs-with-same-name.html
Change-Id: Icfac76b844deaca0c8a0501d7426ff3802e657dc
Reviewed-on: https://chromium-review.googlesource.com/199137
Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Zhenyao Mo <zmo@chromium.org>
5 files changed