This is needed for DXVK. See the following issue: https://github.com/doitsujin/dxvk/issues/108
Should be implemented on latest master with https://cgit.freedesktop.org/mesa/mesa/commit/?id=e361970ed73d0f0a11d93a718dbfe2bf4f38b56d Please reopen if it still gives issues for you.
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