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nir/algebraic: Use a cache to avoid re-emitting structs

Faith Ekstrand requested to merge gfxstrand/mesa:review/nir-algebraic-struct-cache into master

This takes the stupid simplest and most reliable approach to reducing redundancy that I could come up with: Just use the struct declaration as the cach key. This cuts the size of the generated C file to about half and takes about 50 KiB off the .data section.

size before (release build):

   text	   data	    bss	    dec	    hex	filename
5363833	 336880	  13584	5714297	 573179	_install/lib64/libvulkan_intel.so

size after (release build):

   text	   data	    bss	    dec	    hex	filename
5229017	 285264	  13584	5527865	 545939	_install/lib64/libvulkan_intel.so

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