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WIP: nir/algebraic: Replace the big switch with a table

Faith Ekstrand requested to merge gfxstrand/mesa:review/nir-search-xform-table into master

Now that we're using meaningless state indices instead of opcodes, let's just put them all in a table and avoid the switch statement. Surprisingly, this actually makes the binary a bit larger but avoiding the switch might improve perf a bit.

Before this change:

   text	   data	    bss	    dec	    hex	filename
5517205	 481040	 106936	6105181	 5d285d	_install/lib64/libvulkan_intel.so

After this change:

   text	   data	    bss	    dec	    hex	filename
5546301	 565200	 106936	6218437	 5ee2c5	_install/lib64/libvulkan_intel.so

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