[wasm] Add WasmCodeRefScope for printing

Add a WasmCodeRefScope around _v8_internal_Print_Code() because that
is needed for debugging.

R=clemensh@chromium.org

Change-Id: Ifdb7a32695163e0a109567ec00a52196e79e03db
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1585844Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61047}

src/objects-printer.cc

@@ -2741,6 +2741,8 @@ V8_EXPORT_PRIVATE extern void _v8_internal_Print_Code(void* object) {
   i::Address address = reinterpret_cast<i::Address>(object);
   i::Isolate* isolate = i::Isolate::Current();
 
+  {
+    i::wasm::WasmCodeRefScope scope;
     i::wasm::WasmCode* wasm_code =
         isolate->wasm_engine()->code_manager()->LookupCode(address);
     if (wasm_code) {
@@ -2748,6 +2750,7 @@ V8_EXPORT_PRIVATE extern void _v8_internal_Print_Code(void* object) {
       wasm_code->Disassemble(nullptr, os, address);
       return;
     }
+  }
 
   if (!isolate->heap()->InSpaceSlow(address, i::CODE_SPACE) &&
       !isolate->heap()->InSpaceSlow(address, i::LO_SPACE) &&