[wasm] Differentiate unnamed and empty names

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index a8fe6bb7b61b2524c6f84313370ab665b234424e..234527812eb9453147a82eb387d047ea31a20595 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -16,7 +16,6 @@
 #include "src/safepoint-table.h"
 #include "src/string-stream.h"
 #include "src/vm-state-inl.h"
-#include "src/wasm/wasm-module.h"
 
 namespace v8 {
 namespace internal {
@@ -1355,13 +1354,6 @@ uint32_t WasmFrame::function_index() {
   return val;
 }
 
-Object* WasmFrame::function_name() {
-  Object* wasm_object = wasm_obj();
-  if (wasm_object->IsUndefined()) return wasm_object;
-  Handle<JSObject> wasm = handle(JSObject::cast(wasm_object));
-  return *wasm::GetWasmFunctionName(wasm, function_index());
-}
-
 namespace {