[Driver] .tbd files are linker inputs

Author: DougGregor

lib/Driver/Driver.cpp

@@ -1964,6 +1964,7 @@ void Driver::buildActions(SmallVectorImpl<const Action *> &TopLevelActions,
         }
       case file_types::TY_AutolinkFile:
       case file_types::TY_Object:
+      case file_types::TY_TBD:
         // Object inputs are only okay if linking.
         if (OI.shouldLink()) {
           AllLinkerInputs.push_back(Current);
@@ -1987,7 +1988,6 @@ void Driver::buildActions(SmallVectorImpl<const Action *> &TopLevelActions,
       case file_types::TY_IndexData:
       case file_types::TY_PCH:
       case file_types::TY_ImportedModules:
-      case file_types::TY_TBD:
       case file_types::TY_ModuleTrace:
       case file_types::TY_YAMLOptRecord:
       case file_types::TY_BitstreamOptRecord: