nir: sort when printing phi sources
The order can be different each time a shader is compiled, because nir_convert_loop_to_lcssa/nir_convert_to_lcssa adds sources in the order of a block's predecessors.
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The order can be different each time a shader is compiled, because nir_convert_loop_to_lcssa/nir_convert_to_lcssa adds sources in the order of a block's predecessors.