yielding to another thread in atomics tests to make them run properly on single proc machines
yielding to another thread in atomics tests to make them run properly on single proc machines

saxena84/bde,bloomberg/bde,dharesign/bde,RMGiroux/bde-allocator-benchmarks,minhlongdo/bde,jmptrader/bde,dbremner/bde,apaprocki/bde,che2/bde,RMGiroux/bde-allocator-benchmarks,bowlofstew/bde,frutiger/bde,mversche/bde,bloomberg/bde-allocator-benchmarks,saxena84/bde,gbleaney/Allocator-Benchmarks,abeels/bde,abeels/bde,saxena84/bde,bowlofstew/bde,apaprocki/bde,jmptrader/bde,bowlofstew/bde,RMGiroux/bde-allocator-benchmarks,gbleaney/Allocator-Benchmarks,osubboo/bde,mversche/bde,bloomberg/bde-allocator-benchmarks,frutiger/bde,saxena84/bde,idispatch/bde,bloomberg/bde,minhlongdo/bde,abeels/bde,che2/bde,bloomberg/bde-allocator-benchmarks,dharesign/bde,frutiger/bde,che2/bde,osubboo/bde,frutiger/bde,gbleaney/Allocator-Benchmarks,bloomberg/bde,osubboo/bde,dharesign/bde,dbremner/bde,mversche/bde,bloomberg/bde-allocator-benchmarks,gbleaney/Allocator-Benchmarks,bloomberg/bde,dharesign/bde,jmptrader/bde,jmptrader/bde,apaprocki/bde,RMGiroux/bde-allocator-benchmarks,minhlongdo/bde,abeels/bde,abeels/bde,dbremner/bde,apaprocki/bde,idispatch/bde,minhlongdo/bde,idispatch/bde,che2/bde,RMGiroux/bde-allocator-benchmarks,bloomberg/bde-allocator-benchmarks,apaprocki/bde,mversche/bde,bowlofstew/bde,dbremner/bde,abeels/bde,osubboo/bde,bloomberg/bde,idispatch/bde