[Driver] Print a newline when invoking `-print-resource-dir`

The commit yesterday (r299473) to add the `-print-resource-dir`
option was supposed to emit a newline after the resource dir.

Differential Revision: https://reviews.llvm.org/D31447

llvm-svn: 299597

clang/lib/Driver/Driver.cpp

@@ -1170,7 +1170,7 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
     TC.printVerboseInfo(llvm::errs());
 
   if (C.getArgs().hasArg(options::OPT_print_resource_dir)) {
-    llvm::outs() << ResourceDir;
+    llvm::outs() << ResourceDir << '\n';
     return false;
   }