* Index constant buffer vec4s using ternary expressions.
* Remove indexed path.
We determined that it had negligible impact.
* Revert "Remove indexed path."
This reverts commit 25ec4eddfa441e802bd957dfaabc83b23c6bae38.
* Revert "Revert "Remove indexed path.""
This reverts commit 7cd52fecb529dcb9e1a574533bd38531319f1268.