Utilities/wasm: Say something when execution traps

Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/d9ed3b504e4
Pull-request: https://github.com/SerenityOS/serenity/pull/7097
Reviewed-by: https://github.com/Dexesttp

Userland/Utilities/wasm.cpp

@@ -131,6 +131,8 @@ int main(int argc, char* argv[])
             }
 
             auto result = machine.invoke(run_address.value(), move(values));
+            if (result.is_trap())
+                warnln("Execution trapped!");
             if (!result.values().is_empty())
                 warnln("Returned:");
             for (auto& value : result.values()) {