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nir: Misc. infinite loop fixes

This MR fixes a bunch of bugs which came up in the context of infinite loops in shaders.

The one patch I'm not so sure about is "nir: Don't infinitely recurse in lower_ssa_defs_to_regs_block". It seems like it'd be cleaner to actually detect back-edges but doing that is easier said than done.

Edited by Faith Ekstrand

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