It is invalid if the same decoration is applied to the same id multiple
times. This adds a check before adding a decoration that the decoration
is not already in the list. If it is, then the duplicate is not added.
Fixes#3627
This implements a new nonunifom analysis suggested by @jbolz. This change
generates nonUniform decorations that were previously missing and avoids
generation of incorrect decorations. Most notably, it now generates
decorations for nonuniform functions and out params. It avoids generating
decorations for lvalues which themselves are not nonuniform.
The direct pointer argument to stores has to use
the NonUniform decoration but we were not using
qualifiers at all to decorate the NonUniform pointer.
(Test fixes by Greg Fischer <greg@lunarg.com>)
