Fix a [-Werror,-Wcovered-switch-default] warning by removing the

unnecessary default case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253621 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/WebAssembly/Relooper.cpp

@@ -754,7 +754,6 @@ void RelooperAlgorithm::Calculate(Block *Entry) {
           loop(cast<LoopShape>(var));
           break;
         }
-        default: llvm_unreachable("invalid shape");
       }
     }