Add minify_ssa pass sketch #12886

Job	Run time
omnibus compilations, trigger	3s
omnibus compilations, #2	34m 28s
omnibus compilations, #3	25m 35s
omnibus compilations, #1	30m 24s
omnibus compilations, #5	30m 5s
omnibus compilations, #6	28m 47s
omnibus compilations, #4	26m 33s
omnibus compilations, #7	29m 3s
omnibus compilations, #10	21m 45s
omnibus compilations, #12	29m 3s
omnibus compilations, #11	26m 16s
omnibus compilations, #8	26m 45s
omnibus compilations, #9	27m 34s
omnibus compilations, result	6s
	5h 36m 27s

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