[WebAssembly] Fix -Wcovered-switch-default warning

llvm-svn: 299736
diff --git a/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
index 26461e2..f31dde0 100644
--- a/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
+++ b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
@@ -253,7 +253,6 @@
     return "f32";
   case wasm::ValType::F64:
     return "f64";
-  default:
-    llvm_unreachable("unsupported type");
   }
+  llvm_unreachable("unsupported type");
 }