This reverts commit 967df65a3610f98a3bc0ec0f2303641d7bad176c. This fixes test/Shell/SymbolFile/NativePDB/find-functions.cpp. When looking up functions with the PDB plugins, if we are looking for a full function name, we should use `GetName` to populate the `name` field instead of `GetLookupName` since `GetName` has the more complete information.