dynamicbloom fix: don't offset address when it is already aligned
dynamicbloom fix: don't offset address when it is already aligned

Summary: this causes overflow and asan failure

Test Plan: make asan_check

Reviewers: igor

Reviewed By: igor

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17301

vmx/rocksdb,alihalabyah/rocksdb,JohnPJenkins/rocksdb,wlqGit/rocksdb,virtdb/rocksdb,ryneli/rocksdb,NickCis/rocksdb,OverlordQ/rocksdb,NickCis/rocksdb,JackLian/rocksdb,rDSN-Projects/rocksdb.replicated,OverlordQ/rocksdb,Vaisman/rocksdb,tsheasha/rocksdb,vmx/rocksdb,Applied-Duality/rocksdb,tizzybec/rocksdb,mbarbon/rocksdb,wskplho/rocksdb,alihalabyah/rocksdb,ryneli/rocksdb,JohnPJenkins/rocksdb,skunkwerks/rocksdb,luckywhu/rocksdb,facebook/rocksdb,skunkwerks/rocksdb,caijieming-baidu/rocksdb,ylong/rocksdb,geraldoandradee/rocksdb,luckywhu/rocksdb,kaschaeffer/rocksdb,temicai/rocksdb,Andymic/rocksdb,tsheasha/rocksdb,JoeWoo/rocksdb,IMCG/RcoksDB,mbarbon/rocksdb,Applied-Duality/rocksdb,msb-at-yahoo/rocksdb,fengshao0907/rocksdb,wskplho/rocksdb,mbarbon/rocksdb,Andymic/rocksdb,JoeWoo/rocksdb,wenduo/rocksdb,JoeWoo/rocksdb,wlqGit/rocksdb,wat-ze-hex/rocksdb,tschottdorf/rocksdb,jalexanderqed/rocksdb,mbarbon/rocksdb,virtdb/rocksdb,zhangpng/rocksdb,dkorolev/rocksdb,flabby/rocksdb,fengshao0907/rocksdb,SunguckLee/RocksDB,ryneli/rocksdb,facebook/rocksdb,caijieming-baidu/rocksdb,tschottdorf/rocksdb,wenduo/rocksdb,siddhartharay007/rocksdb,zhangpng/rocksdb,NickCis/rocksdb,geraldoandradee/rocksdb,lgscofield/rocksdb,Vaisman/rocksdb,JoeWoo/rocksdb,JackLian/rocksdb,wlqGit/rocksdb,tizzybec/rocksdb,tschottdorf/rocksdb,anagav/rocksdb,hobinyoon/rocksdb,zhangpng/rocksdb,wskplho/rocksdb,norton/rocksdb,bbiao/rocksdb,kaschaeffer/rocksdb,Vaisman/rocksdb,wlqGit/rocksdb,Applied-Duality/rocksdb,flabby/rocksdb,JackLian/rocksdb,ylong/rocksdb,SunguckLee/RocksDB,Vaisman/rocksdb,lgscofield/rocksdb,biddyweb/rocksdb,JoeWoo/rocksdb,zhangpng/rocksdb,tizzybec/rocksdb,msb-at-yahoo/rocksdb,RyanTech/rocksdb,anagav/rocksdb,bbiao/rocksdb,jalexanderqed/rocksdb,IMCG/RcoksDB,flabby/rocksdb,alihalabyah/rocksdb,siddhartharay007/rocksdb,IMCG/RcoksDB,hobinyoon/rocksdb,IMCG/RcoksDB,rDSN-Projects/rocksdb.replicated,ylong/rocksdb,lgscofield/rocksdb,vashstorm/rocksdb,ryneli/rocksdb,Andymic/rocksdb,wat-ze-hex/rocksdb,temicai/rocksdb,JohnPJenkins/rocksdb,temicai/rocksdb,bbiao/rocksdb,kaschaeffer/rocksdb,wlqGit/rocksdb,fengshao0907/rocksdb,makelivedotnet/rocksdb,makelivedotnet/rocksdb,rDSN-Projects/rocksdb.replicated,tsheasha/rocksdb,makelivedotnet/rocksdb,tsheasha/rocksdb,siddhartharay007/rocksdb,jalexanderqed/rocksdb,ylong/rocksdb,tschottdorf/rocksdb,amyvmiwei/rocksdb,JackLian/rocksdb,mbarbon/rocksdb,flabby/rocksdb,wat-ze-hex/rocksdb,alihalabyah/rocksdb,wskplho/rocksdb,caijieming-baidu/rocksdb,norton/rocksdb,dkorolev/rocksdb,biddyweb/rocksdb,tizzybec/rocksdb,wenduo/rocksdb,sorphi/rocksdb,dkorolev/rocksdb,biddyweb/rocksdb,JackLian/rocksdb,geraldoandradee/rocksdb,caijieming-baidu/rocksdb,caijieming-baidu/rocksdb,mbarbon/rocksdb,ylong/rocksdb,norton/rocksdb,luckywhu/rocksdb,Andymic/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,Vaisman/rocksdb,tsheasha/rocksdb,virtdb/rocksdb,Applied-Duality/rocksdb,luckywhu/rocksdb,OverlordQ/rocksdb,vashstorm/rocksdb,facebook/rocksdb,tizzybec/rocksdb,lgscofield/rocksdb,norton/rocksdb,tizzybec/rocksdb,Andymic/rocksdb,fengshao0907/rocksdb,makelivedotnet/rocksdb,norton/rocksdb,amyvmiwei/rocksdb,anagav/rocksdb,geraldoandradee/rocksdb,skunkwerks/rocksdb,facebook/rocksdb,IMCG/RcoksDB,ryneli/rocksdb,virtdb/rocksdb,kaschaeffer/rocksdb,makelivedotnet/rocksdb,luckywhu/rocksdb,facebook/rocksdb,lgscofield/rocksdb,sorphi/rocksdb,JohnPJenkins/rocksdb,sorphi/rocksdb,hobinyoon/rocksdb,Applied-Duality/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,ryneli/rocksdb,rDSN-Projects/rocksdb.replicated,JackLian/rocksdb,fengshao0907/rocksdb,RyanTech/rocksdb,JackLian/rocksdb,wat-ze-hex/rocksdb,amyvmiwei/rocksdb,sorphi/rocksdb,JoeWoo/rocksdb,norton/rocksdb,mbarbon/rocksdb,makelivedotnet/rocksdb,virtdb/rocksdb,wat-ze-hex/rocksdb,biddyweb/rocksdb,SunguckLee/RocksDB,OverlordQ/rocksdb,wat-ze-hex/rocksdb,geraldoandradee/rocksdb,JohnPJenkins/rocksdb,vmx/rocksdb,geraldoandradee/rocksdb,JoeWoo/rocksdb,siddhartharay007/rocksdb,NickCis/rocksdb,alihalabyah/rocksdb,zhangpng/rocksdb,Andymic/rocksdb,zhangpng/rocksdb,temicai/rocksdb,SunguckLee/RocksDB,sorphi/rocksdb,fengshao0907/rocksdb,wskplho/rocksdb,alihalabyah/rocksdb,ylong/rocksdb,lgscofield/rocksdb,SunguckLee/RocksDB,jalexanderqed/rocksdb,vashstorm/rocksdb,skunkwerks/rocksdb,virtdb/rocksdb,msb-at-yahoo/rocksdb,hobinyoon/rocksdb,IMCG/RcoksDB,vmx/rocksdb,kaschaeffer/rocksdb,kaschaeffer/rocksdb,NickCis/rocksdb,kaschaeffer/rocksdb,anagav/rocksdb,Vaisman/rocksdb,vashstorm/rocksdb,flabby/rocksdb,tschottdorf/rocksdb,wenduo/rocksdb,dkorolev/rocksdb,dkorolev/rocksdb,vmx/rocksdb,sorphi/rocksdb,flabby/rocksdb,bbiao/rocksdb,facebook/rocksdb,vmx/rocksdb,RyanTech/rocksdb,makelivedotnet/rocksdb,msb-at-yahoo/rocksdb,Vaisman/rocksdb,virtdb/rocksdb,skunkwerks/rocksdb,alihalabyah/rocksdb,RyanTech/rocksdb,flabby/rocksdb,Andymic/rocksdb,skunkwerks/rocksdb,caijieming-baidu/rocksdb,siddhartharay007/rocksdb,NickCis/rocksdb,hobinyoon/rocksdb,anagav/rocksdb,vmx/rocksdb,RyanTech/rocksdb,bbiao/rocksdb,ylong/rocksdb,Applied-Duality/rocksdb,vmx/rocksdb,wenduo/rocksdb,geraldoandradee/rocksdb,temicai/rocksdb,OverlordQ/rocksdb,luckywhu/rocksdb,tizzybec/rocksdb,biddyweb/rocksdb,wlqGit/rocksdb,norton/rocksdb,jalexanderqed/rocksdb,NickCis/rocksdb,temicai/rocksdb,wat-ze-hex/rocksdb,JohnPJenkins/rocksdb,vashstorm/rocksdb,zhangpng/rocksdb,vashstorm/rocksdb,hobinyoon/rocksdb,wlqGit/rocksdb,dkorolev/rocksdb,RyanTech/rocksdb,SunguckLee/RocksDB,amyvmiwei/rocksdb,JohnPJenkins/rocksdb,Andymic/rocksdb,biddyweb/rocksdb,skunkwerks/rocksdb,wskplho/rocksdb,amyvmiwei/rocksdb,msb-at-yahoo/rocksdb,amyvmiwei/rocksdb,vashstorm/rocksdb,fengshao0907/rocksdb,siddhartharay007/rocksdb,wenduo/rocksdb,IMCG/RcoksDB,tsheasha/rocksdb,bbiao/rocksdb,dkorolev/rocksdb,caijieming-baidu/rocksdb,bbiao/rocksdb,amyvmiwei/rocksdb,sorphi/rocksdb,anagav/rocksdb,wenduo/rocksdb,siddhartharay007/rocksdb,temicai/rocksdb,wat-ze-hex/rocksdb,rDSN-Projects/rocksdb.replicated,jalexanderqed/rocksdb,facebook/rocksdb,norton/rocksdb,biddyweb/rocksdb,msb-at-yahoo/rocksdb,OverlordQ/rocksdb,anagav/rocksdb,lgscofield/rocksdb,jalexanderqed/rocksdb,SunguckLee/RocksDB,OverlordQ/rocksdb,wskplho/rocksdb,Applied-Duality/rocksdb,RyanTech/rocksdb,hobinyoon/rocksdb,luckywhu/rocksdb,rDSN-Projects/rocksdb.replicated,ryneli/rocksdb,tschottdorf/rocksdb,hobinyoon/rocksdb,rDSN-Projects/rocksdb.replicated,facebook/rocksdb,wenduo/rocksdb