nir: add divergence analysis pass.
This pass expects the shader to be in LCSSA form. The algorithm is based on 'The Simple Divergence Analysis' from Diogo Sampaio, Rafael De Souza, Sylvain Collange, Fernando Magno Quintão Pereira. Divergence Analysis. ACM Transactions on Programming Languages and Systems (TOPLAS) Reviewed-by:Jason Ekstrand <jason@jlekstrand.net> Reviewed-by:
Connor Abbott <cwabbott0@gmail.com>
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