Merge pull request dotnet/coreclr#12255 from briansull/concat-fix
authorBrian Sullivan <briansul@microsoft.com>
Wed, 14 Jun 2017 00:55:05 +0000 (17:55 -0700)
committerGitHub <noreply@github.com>
Wed, 14 Jun 2017 00:55:05 +0000 (17:55 -0700)
Removed the unused vararg version of String Concat

Commit migrated from https://github.com/dotnet/coreclr/commit/9def2055bab6e154806a800816a05ab811f056f6


Trivial merge