freedreno/a6xx: add support for ARB_shader_stencil_export
Copied from Turnip.
There are no CTS tests and only two piglit:
glsl-fs-shader-stencil-exportfbo-depth-array
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Copied from Turnip.
There are no CTS tests and only two piglit:
glsl-fs-shader-stencil-exportfbo-depth-array