[wasm] Use a Managed<WasmModule> to hold metadata about modules.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 09cb9405be41a69a0247c14b7d1aff4d03c20b95..144e0db5b22b496793de6ab4b5ec6f8c712ef419 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -183,6 +183,10 @@ class V8_EXPORT_PRIVATE Factory final {
   MUST_USE_RESULT MaybeHandle<String> NewStringFromUtf8(
       Vector<const char> str, PretenureFlag pretenure = NOT_TENURED);
 
+  MUST_USE_RESULT MaybeHandle<String> NewStringFromUtf8SubString(
+      Handle<SeqOneByteString> str, int begin, int end,
+      PretenureFlag pretenure = NOT_TENURED);
+
   MUST_USE_RESULT MaybeHandle<String> NewStringFromTwoByte(
       Vector<const uc16> str, PretenureFlag pretenure = NOT_TENURED);