wasm: implemente WasmFrame::cast, fix inheritance

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index cfacbac45922f547258b75a11f179828aa4b96f3..1e3dd32a97034bff9fa8636b00c8e2ac55e3f90a 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -749,7 +749,7 @@ void StandardFrame::IterateCompiledFrame(ObjectVisitor* v) const {
   safepoint_bits += kNumSafepointRegisters >> kBitsPerByteLog2;
 
   // Visit the rest of the parameters.
-  if (!is_js_to_wasm() && !is_wasm()) {
+  if (!is_wasm() || is_wasm_to_js()) {
     // Non-WASM frames have tagged values as parameters.
     v->VisitPointers(parameters_base, parameters_limit);
   }
@@ -766,7 +766,7 @@ void StandardFrame::IterateCompiledFrame(ObjectVisitor* v) const {
   // Visit the return address in the callee and incoming arguments.
   IteratePc(v, pc_address(), constant_pool_address(), code);
 
-  if (!is_wasm() && !is_wasm_to_js()) {
+  if (!is_wasm() || is_js_to_wasm()) {
     // Visit the context in stub frame and JavaScript frame.
     // Visit the function in JavaScript frame.
     v->VisitPointers(frame_header_base, frame_header_limit);