Porting corefx PR #8156
Porting corefx PR #8156

* [WIP] Algorithm.dll base support for elliptic curves and export.

ElJerry/wcf,dotnet/wcf,iamjasonp/wcf,imcarolwang/wcf,zhenlan/wcf,iamjasonp/wcf,MattGal/wcf,KKhurin/wcf,StephenBonikowsky/wcf,MattGal/wcf,ericstj/wcf,mconnew/wcf,hongdai/wcf,imcarolwang/wcf,ericstj/wcf,zhenlan/wcf,dotnet/wcf,StephenBonikowsky/wcf,KKhurin/wcf,mconnew/wcf,imcarolwang/wcf,dotnet/wcf,hongdai/wcf,mconnew/wcf,shmao/wcf,ElJerry/wcf,shmao/wcf