[Bug 94477] Too many temporary expressions in shader freeze glLinkProgram

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94477

--- Comment #1 from Matt Turner <mattst88 at gmail.com> ---
Thank you for the excellent bug report. I wish the average report was half this
good.

Running your example program with a profiler shows that the do_copy_propagation
and do_copy_propagation_elements passes are taking all the time.

I suspect this is because internally they use linked lists for the acp/kill
sets when they should be using hash tables. Ken fixed a similar problem in
commit 4654439fd.

I'll look into making this change.

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