Restore TypeForwards from S.P.Interop
Restore TypeForwards from S.P.Interop

This makes all of our System.Private assemblies compatible with the 6.0.1 version of the CoreFX metapackage.

[tfs-changeset: 1688091]

gregkalapos/corert,gregkalapos/corert,gregkalapos/corert,gregkalapos/corert