Merge branch 'CogMT' into Cog #523

Job	Run time
squeak.cog.spur for linux32ARMv6	14m 1s
squeak.cog.spur for linux32ARMv6 (DEBUG)	10m 57s
squeak.cog.spur for linux32ARMv6 (ASSERT)	13m 9s
squeak.stack.spur for linux32ARMv6	14m 15s
squeak.stack.spur for linux32ARMv6 (DEBUG)	11m 1s
squeak.stack.spur for linux32ARMv6 (ASSERT)	12m 49s
squeak.cog.spur for linux64ARMv8	19m 10s
squeak.cog.spur for linux64ARMv8 (DEBUG)	10m 51s
squeak.cog.spur for linux64ARMv8 (ASSERT)	12m 46s
squeak.stack.spur for linux64ARMv8	13m 28s
squeak.stack.spur for linux64ARMv8 (DEBUG)	13m 13s
squeak.stack.spur for linux64ARMv8 (ASSERT)	11m 32s
	2h 37m 12s

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