Pass .tbd inputs down to the linker invocation.

Part of rdar://78881502

Author: artemcm

lib/Driver/DarwinToolChains.cpp

@@ -254,9 +254,12 @@ toolchains::Darwin::addLinkerInputArgs(InvocationInfo &II,
   } else {
     addPrimaryInputsOfType(Arguments, context.Inputs, context.Args,
                            file_types::TY_Object);
+    addPrimaryInputsOfType(Arguments, context.Inputs, context.Args,
+                           file_types::TY_TBD);
     addPrimaryInputsOfType(Arguments, context.Inputs, context.Args,
                            file_types::TY_LLVM_BC);
     addInputsOfType(Arguments, context.InputActions, file_types::TY_Object);
+    addInputsOfType(Arguments, context.InputActions, file_types::TY_TBD);
     addInputsOfType(Arguments, context.InputActions, file_types::TY_LLVM_BC);
   }
 

test/Driver/linker-tbd.swift

@@ -0,0 +1,9 @@
+// REQUIRES: OS=macosx
+// Ensure .tbd input files are forwarded to the linker.
+
+// RUN: %empty-directory(%t)
+// RUN: touch %t/foo.tbd
+// RUN: %swiftc_driver_plain -driver-print-jobs -target x86_64-apple-macosx10.9 %S/../Inputs/empty.swift %t/foo.tbd | %FileCheck %s
+
+// CHECK: bin/ld{{"? }}
+// CHECK-SAME: foo.tbd