De-virtualize a method that doesn't override anything and has no overrides itself.

llvm-svn: 203895
diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index 71b3bf5..069acdc 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -172,8 +172,8 @@
 
     bool hasIntegratedCPP() const override { return false; }
 
-    virtual void RenderExtraToolArgs(const JobAction &JA,
-                                     llvm::opt::ArgStringList &CmdArgs) const;
+    void RenderExtraToolArgs(const JobAction &JA,
+                             llvm::opt::ArgStringList &CmdArgs) const;
     void ConstructJob(Compilation &C, const JobAction &JA,
                       const InputInfo &Output, const InputInfoList &Inputs,
                       const llvm::opt::ArgList &TCArgs,