Once #111598 propagates to the tools runtime, we should switch the runtime tools (ILCompiler, crossgen2, etc.) to use it.
The task is to:
- Delete the src/libraries/Common/src/System/Reflection/Metadata/TypeNameHelpers.cs file
- Remove the references to this file from all project files
- Replace the uses of
TypeNameHelpers.Unescape with TypeName.Unescape
- Replace the uses of
TypeNameHelpers.Split with the Namespace and Name properties on the TypeName type.