LibWasm: Avoid repeated shrinkage of value stack

Author: https://github.com/alimpfard
Commit: 5c6f223f48
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5060
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/R-Goc
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/gmta

Libraries/LibWasm/AbstractMachine/Configuration.cpp

@@ -52,10 +52,9 @@ Result Configuration::execute(Interpreter& interpreter)
     if (interpreter.did_trap())
         return interpreter.trap();
 
-    Vector<Value> results;
+    Vector<Value> results { value_stack().span().slice_from_end(frame().arity()) };
-    results.ensure_capacity(frame().arity());
+    value_stack().shrink(value_stack().size() - results.size(), true);
-    for (size_t i = 0; i < frame().arity(); ++i)
+    results.reverse();
-        results.unchecked_append(value_stack().take_last());
 
     label_stack().take_last();
     return Result { move(results) };