Bug fix in Span<T>
Bug fix in Span<T>

The bug was causing some arrays to be copied twice

stephentoub/corefxlab,stephentoub/corefxlab,VSadov/corefxlab,VSadov/corefxlab,ericstj/corefxlab,alexperovich/corefxlab,joshfree/corefxlab,dotnet/corefxlab,ericstj/corefxlab,Vedin/corefxlab,t-roblo/corefxlab,Vedin/corefxlab,VSadov/corefxlab,ahsonkhan/corefxlab,ericstj/corefxlab,benaadams/corefxlab,joshfree/corefxlab,tarekgh/corefxlab,adamsitnik/corefxlab,ericstj/corefxlab,hanblee/corefxlab,shhsu/corefxlab,ahsonkhan/corefxlab,stephentoub/corefxlab,axxu/corefxlab,ericstj/corefxlab,KrzysztofCwalina/corefxlab,benaadams/corefxlab,hanblee/corefxlab,ravimeda/corefxlab,weshaggard/corefxlab,whoisj/corefxlab,Vedin/corefxlab,dotnet/corefxlab,nguerrera/corefxlab,mafiya69/corefxlab,stephentoub/corefxlab,adamsitnik/corefxlab,jamesqo/corefxlab,dalbanhi/corefxlab,tarekgh/corefxlab,Vedin/corefxlab,livarcocc/corefxlab,ericstj/corefxlab,Vedin/corefxlab,KrzysztofCwalina/corefxlab,VSadov/corefxlab,VSadov/corefxlab,stephentoub/corefxlab,VSadov/corefxlab,whoisj/corefxlab,Vedin/corefxlab,stephentoub/corefxlab