[wasm] Differentiate unnamed and empty names

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index 0438dba7c275ab264a4af6723663b82f12f3cb3b..f67919ef88033660e6544fcf41b89a972327b14f 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -202,7 +202,7 @@ struct WasmModule {
 
   // Get a string stored in the module bytes representing a name.
   WasmName GetNameOrNull(uint32_t offset, uint32_t length) const {
-    if (length == 0) return {NULL, 0};  // no name.
+    if (offset == 0 && length == 0) return {NULL, 0};  // no name.
     CHECK(BoundsCheck(offset, offset + length));
     DCHECK_GE(static_cast<int>(length), 0);
     return {reinterpret_cast<const char*>(module_start + offset),