Add minify_ssa pass sketch #12887

Job	Run time
omnibus compilations, trigger	4s
omnibus compilations, #2	33m 28s
omnibus compilations, #3	27m 20s
omnibus compilations, #6	29m 21s
omnibus compilations, #5	28m 33s
omnibus compilations, #4	27m 16s
omnibus compilations, #7	28m 7s
omnibus compilations, #1	29m 30s
omnibus compilations, #10	32m 53s
omnibus compilations, #11	26m 4s
omnibus compilations, #9	30m 18s
omnibus compilations, #8	20m 28s
omnibus compilations, #12	26m 48s
omnibus compilations, result	5s
	5h 40m 15s

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