[Bug 90056] Unigine Valley regression since radeon/llvm: Run LLVM's instruction combining pass

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90056

--- Comment #4 from Grigori Goronzy <greg at chown.ath.cx> ---
Created attachment 115333
  --> https://bugs.freedesktop.org/attachment.cgi?id=115333&action=edit
Reduced test case

Here's a reduced testcase. I'm not sure how undef branch conditions are
supposed to be handled, make someone else can take a look?

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