Use concurrent dictionary in NMM - 17.11 backport#17571

psfinaki merged 2 commits into

dotnet:release/dev17.11dotnet/fsharp:release/dev17.11from

vzarytovskii:concurrent-safe-ce-checkking-dev1711vzarytovskii/fsharp:concurrent-safe-ce-checkking-dev1711Copy head branch name to clipboard