Fix bsls_atomic*.t.cpp failures for 32-bit builds on AIX xlC 11.1
Fix bsls_atomic*.t.cpp failures for 32-bit builds on AIX xlC 11.1

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