Here's a pair of patches I came up with tonight when looking at #18074 and
#14503.  The first looks like we might end up with junk in a temporary if
we wrote it, did a masked texld, then wrote to it again with a destination
write mask.

The second creates a mapping from register->Index to hardware temporary
registers.  I don't have the apps in question, so I haven't tested it.
Searching for people reporting the message came up with these two bug reports
plus cube, and I found that sauer did trigger it.  However, sauer still fails
on a bunch of its shaders due to texture indirections, so I can't place
accurate blame for the nasty rendering I see.



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