[Bug 90000] [i965 Bisected NIR] Piglit/gglean_fragprog1-z-write_test fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90000

--- Comment #6 from Matt Turner <mattst88 at gmail.com> ---
We're losing, what is presumably, our depth write:

pass -> fail

 mov(8)          g123<1>F        g2<0,1,0>F
 mov(8)          g124<1>F        g2.1<0,1,0>F
 mov(8)          g125<1>F        g2.2<0,1,0>F
 mov(8)          g126<1>F        g2.3<0,1,0>F
-mov(8)          g127<1>F        g2.1<0,1,0>F
 sendc(8)        null            g123<8,8,1>F
                 render RT write SIMD8 LastRT Surface = 0 mlen 5 rlen 0

The mlen is still correct, so we're writing uninitialized values.

Checking out commit 1ca60de4c (before we deleted the non-NIR paths), you can
run with INTEL_USE_NIR=0 and the test passes.

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