nir/tests: Add tests for opt_if_simplification
Test cases:
opt_if_simplification - the most trivial test case.
opt_if_simplification_single_source_phi_after_if - tests that
opt_if_simplification correctly handles single-source phis after
the if, found in https://gitlab.freedesktop.org/mesa/mesa/-/issues/3282
Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5945>
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