[wasm] grow_memory(0) is the same as memory_size()

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index f4cf505f5a910761dda7ba846dcc2f4ee630be89..9791cd9f7a1d846864c5cec63d1efffdc69485e4 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -1822,6 +1822,9 @@ int32_t GetInstanceMemorySize(Isolate* isolate, Handle<JSObject> instance) {
 
 int32_t GrowInstanceMemory(Isolate* isolate, Handle<JSObject> instance,
                            uint32_t pages) {
+  if (pages == 0) {
+    return GetInstanceMemorySize(isolate, instance);
+  }
   Address old_mem_start = nullptr;
   uint32_t old_size = 0, new_size = 0;