Driver: Suppress some additional warnings with -Qunused-arguments.

llvm-svn: 129853
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 39ace11..fc4d86c 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -858,6 +858,10 @@
       // Claim here to avoid the more general unused warning.
       InputArg->claim();
 
+      // Suppress all unused style warnings with -Qunused-arguments
+      if (Args.hasArg(options::OPT_Qunused_arguments))
+        continue;
+
       // Special case '-E' warning on a previously preprocessed file to make
       // more sense.
       if (InitialPhase == phases::Compile && FinalPhase == phases::Preprocess &&