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mesa/st: release variants for active programs before unref

Tapani Pälli requested to merge tpalli/mesa:night-of-the-living-shader-variant into master 
    mesa/st: release variants for active programs before unref
    
    Programs can be shared among many contexts and each program holds a
    variant list which has context specific variants. When context gets
    destroyed it must make sure it relases all variants, otherwise remaining
    context that utilizes same program will attempt to save a zombie shader
    for already deleted context when releasing program and its variants.
    
    Fixes:
       dEQP-EGL.functional.sharing.gles2.program.render
    
    and other flaky multihread dEQP-EGL failures.
    
    Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
    Cc: mesa-stable@lists.freedesktop.org
Edited by Tapani Pälli

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