[Nouveau] [Bug 90887] PhiMovesPass in register allocator broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90887

--- Comment #9 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 116566
  --> https://bugs.freedesktop.org/attachment.cgi?id=116566&action=edit
another attempted fix

ok, this is my attempt at fixing this. upon a very quick perusal, it seems like
it works for the sample program.

i like this a little more not only because i wrote it, but also because it
avoids touching code that i barely understand and seems very fragile (including
the graph code).

could you give this a shot and see if it also fixes your issues?

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