Fix "control may reach end of non-void function" warning.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146448 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/Tools.cpp

@@ -990,8 +990,7 @@ static const char *getHexagonTargetCPU(const ArgList &Args)
         assert(0 && "Unknown -m argument.");
     }
   }
-  else
-    return "hexagonv2";
+  return "hexagonv2";
 }
 
 void Clang::AddHexagonTargetArgs(const ArgList &Args,