Removes Extra allocations for corner cases in CombineNochecks (#16255)
Removes Extra allocations for corner cases in CombineNochecks (#16255)

* Added String Overload

Signed-off-by: dotnet-bot-corefx-mirror <03c4cb6107ae99956a7681f2c97ff7104809a2bd@microsoft.com>

shimingsg/corefx,ptoonen/corefx,ptoonen/corefx,ravimeda/corefx,ericstj/corefx,BrennanConroy/corefx,wtgodbe/corefx,shimingsg/corefx,ptoonen/corefx,Jiayili1/corefx,ericstj/corefx,ptoonen/corefx,Jiayili1/corefx,shimingsg/corefx,ravimeda/corefx,ericstj/corefx,Jiayili1/corefx,ravimeda/corefx,mmitche/corefx,ravimeda/corefx,shimingsg/corefx,ericstj/corefx,ViktorHofer/corefx,ViktorHofer/corefx,wtgodbe/corefx,ptoonen/corefx,zhenlan/corefx,wtgodbe/corefx,zhenlan/corefx,ViktorHofer/corefx,zhenlan/corefx,ptoonen/corefx,ViktorHofer/corefx,mmitche/corefx,zhenlan/corefx,wtgodbe/corefx,zhenlan/corefx,mmitche/corefx,ViktorHofer/corefx,wtgodbe/corefx,Jiayili1/corefx,mmitche/corefx,ravimeda/corefx,zhenlan/corefx,BrennanConroy/corefx,shimingsg/corefx,ravimeda/corefx,ptoonen/corefx,shimingsg/corefx,Jiayili1/corefx,ericstj/corefx,ericstj/corefx,BrennanConroy/corefx,ericstj/corefx,ViktorHofer/corefx,shimingsg/corefx,mmitche/corefx,ViktorHofer/corefx,ravimeda/corefx,Jiayili1/corefx,wtgodbe/corefx,zhenlan/corefx,wtgodbe/corefx,mmitche/corefx,mmitche/corefx,Jiayili1/corefx