As mentioned in the patch itself, this is fairly benign, but still junk that a later pass has to be able to eliminate. Is easier to just not produce it in the first place.

Bug: b/116263076
Change-Id: I199672bb9b53eb4ee9d4a8e3a23fc2ce42f0dec6
Reviewed-on: https://swiftshader-review.googlesource.com/20770Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>