[do not merge] isel example

[luisacicolini]

one of the patterns we used as an instruction selection examples.

[github-actions]

VeIR Benchmarks

Details

Benchmark suite	Current: fb6be79	Previous: 343f395	Ratio
add-fold-worklist/create	2240000 ns (± 113076)	2258500 ns (± 75700)	0.99
add-fold-worklist/rewrite	3812000 ns (± 88063)	3848000 ns (± 465582)	0.99
add-fold-worklist-local/create	2228000 ns (± 58900)	2334500 ns (± 80138)	0.95
add-fold-worklist-local/rewrite	3149000 ns (± 70719)	3366500 ns (± 156841)	0.94
add-zero-worklist/create	2291000 ns (± 81490)	2249000 ns (± 20864)	1.02
add-zero-worklist/rewrite	2392000 ns (± 49774)	2535000 ns (± 80844)	0.94
add-zero-reuse-worklist/create	1869000 ns (± 53791)	1836000 ns (± 44875)	1.02
add-zero-reuse-worklist/rewrite	1943000 ns (± 9576)	2035000 ns (± 85402)	0.95
mul-two-worklist/create	2203000 ns (± 106608)	2313000 ns (± 64485)	0.95
mul-two-worklist/rewrite	5269000 ns (± 66530)	5509000 ns (± 134495)	0.96
add-fold-forwards/create	2227000 ns (± 85690)	2282500 ns (± 127356)	0.98
add-fold-forwards/rewrite	3068000 ns (± 145042)	3076500 ns (± 83977)	1.00
add-zero-forwards/create	2257000 ns (± 111237)	2218000 ns (± 77709)	1.02
add-zero-forwards/rewrite	1976000 ns (± 45569)	1943000 ns (± 53594)	1.02
add-zero-reuse-forwards/create	1926000 ns (± 48076)	1878000 ns (± 88933)	1.03
add-zero-reuse-forwards/rewrite	1572000 ns (± 48081)	1539000 ns (± 76864)	1.02
mul-two-forwards/create	2254000 ns (± 47310)	2276000 ns (± 57860)	0.99
mul-two-forwards/rewrite	3622000 ns (± 86582)	3754000 ns (± 56972)	0.96
add-zero-reuse-first/create	1875500 ns (± 61265)	1876000 ns (± 68653)	1.00
add-zero-reuse-first/rewrite	8000 ns (± 1269)	8000 ns (± 1073)	1
add-zero-lots-of-reuse-first/create	1955000 ns (± 95981)	1839000 ns (± 68196)	1.06
add-zero-lots-of-reuse-first/rewrite	763000 ns (± 29012)	762000 ns (± 15498)	1.00

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