apply ctx-switching patch #688

Job	Run time
omnibus compilations, trigger	2s
omnibus compilations, #1	29m 47s
omnibus compilations, #5	27m 39s
omnibus compilations, #11	23m 44s
omnibus compilations, #3	33m 39s
omnibus compilations, #9	27m 31s
omnibus compilations, #12	14m 18s
omnibus compilations, #7	33m 55s
omnibus compilations, #2	34m 52s
omnibus compilations, #6	27m 20s
omnibus compilations, #4	25m 41s
omnibus compilations, #10	27m 53s
omnibus compilations, #8	27m 32s
omnibus compilations, result	6s
	5h 33m 59s

Provide feedback