[wasm] GC should ignore unboxed stack parameters in WASM frames.

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 362ae89399e977b646f3b4ab0fd33182c63a1670..67a03081e5045a826e08f55454ee9620d2c0b269 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -743,7 +743,10 @@ void StandardFrame::IterateCompiledFrame(ObjectVisitor* v) const {
   safepoint_bits += kNumSafepointRegisters >> kBitsPerByteLog2;
 
   // Visit the rest of the parameters.
-  v->VisitPointers(parameters_base, parameters_limit);
+  if (!is_js_to_wasm() && !is_wasm()) {
+    // Non-WASM frames have tagged values as parameters.
+    v->VisitPointers(parameters_base, parameters_limit);
+  }
 
   // Visit pointer spill slots and locals.
   for (unsigned index = 0; index < stack_slots; index++) {