[PATCH] Add missing override keyword

[Brad Smith]

When adding the IsIntegratedAssemblerDefault() bits for OpenBSD
I missed adding the override keyword when bringing the code
forward from an older code base.

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Index: ToolChains.h
===================================================================
--- ToolChains.h	(revision 214058)
+++ ToolChains.h	(working copy)
@@ -537,7 +537,7 @@
     return 2;
   }
 
-  virtual bool IsIntegratedAssemblerDefault() const {
+  virtual bool IsIntegratedAssemblerDefault() const override {
     if (getTriple().getArch() == llvm::Triple::ppc ||
         getTriple().getArch() == llvm::Triple::sparc ||
         getTriple().getArch() == llvm::Triple::sparcv9)