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Add Subgroup Scan functions for SI

Daniel Schürmann requested to merge daniel-schuermann/mesa:SI_subgroups_scan into master

These patches were originally written in May 2018, but never landed for some reason...

There is some optimization opportunity left for scans on CS by using LDS.

Passes all enabled subgroups CTS tests (the shuffle feature is not supported as it would require a loop over all lanes in the subgroup, maybe we can lower it in NIR).

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