More dead code removal (using -Wunreachable-code)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148578 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/Interpreter/Execution.cpp

@@ -1254,7 +1254,6 @@ GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE,
   default:
     dbgs() << "Unhandled ConstantExpr: " << *CE << "\n";
     llvm_unreachable(0);
-    return GenericValue();
   }
   return Dest;
 }