Reapply "ZJIT: Skip WriteBarrier if the value being written is immedi… #773

Job	Run time
omnibus compilations, trigger	4s
omnibus compilations, #4	27m 10s
omnibus compilations, #6	29m 34s
omnibus compilations, #3	37m 6s
omnibus compilations, #1	28m 43s
omnibus compilations, #2	33m 51s
omnibus compilations, #11	25m 42s
omnibus compilations, #5	28m 52s
omnibus compilations, #7	35m 28s
omnibus compilations, #8	28m 20s
omnibus compilations, #10	29m 12s
omnibus compilations, #9	29m 38s
omnibus compilations, #12	15m 4s
omnibus compilations, result	11s
	5h 48m 55s

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