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anv: Account for dynamic stencil write disables in the PMA fix

Faith Ekstrand requested to merge gfxstrand/mesa:review/bug-109203 into master

In 6ce85928 we started looking at the dynamic stencil state and disabling stencil writes when the stencil mask is zero. Unfortunately, we never updated the PMA fix code accordingly so 3DSTATE_WM_DEPTH_STENCIL and the PMA fix were getting out-of-sync causing hangs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109203 Fixes: 6ce85928 "anv: Disable stencil writes when both write..."

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