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Enable EXT_shader_framebuffer_fetch[_non_coherent] and KHR_blend_equation_advanced_coherent

Kenneth Graunke requested to merge kwg/mesa:iris-fbfetch into master

This series adds a new capability for whether the driver can support framebuffer fetches which are coherent with framebuffer writes, and exposes:

  • KHR_blend_equation_advanced_coherent
  • EXT_shader_framebuffer_fetch (which is coherent)
  • EXT_shader_framebuffer_fetch_non_coherent (Curro's extension which could have been exposed but wasn't)

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