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anv: bump internal descriptor index fields to 32bits

Lionel Landwerlin requested to merge llandwerlin/mesa:review/anv-fix-descriptor-layout-internals into master

Prior to supporting VK_EXT_descriptor_indexing all of our descriptor limits where below 64k which fitted a uint16_t. Now all of those can go up to 2^20 entries so we need 32bits indexes to keep track of them.

This change leaves the dynamic indexes at 16bits. We could arguably bump them too, up to the reviewer's taste.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Fixes: 6e230d76 ("anv: Implement VK_EXT_descriptor_indexing") Closes: #4636 (closed)

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