[APPROVAL] INTERNAL version-2.19.0 to master
[APPROVAL] INTERNAL version-2.19.0 to master

Base commit: 6a21a903c9bfe533d17f93ac04089ca0f4dac586

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