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

src/factory.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/globals.h"
 #include "src/isolate.h"
 #include "src/messages.h"
@@ skipping 165 matching lines @@
       Vector<const char> str,
       PretenureFlag pretenure = NOT_TENURED) {
     return NewStringFromOneByte(Vector<const uint8_t>::cast(str), pretenure);
   }
 
   // UTF8 strings are pretenured when used for regexp literal patterns and
   // flags in the parser.
   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);
 
   MUST_USE_RESULT MaybeHandle<String> NewStringFromTwoByte(
       const ZoneVector<uc16>* str, PretenureFlag pretenure = NOT_TENURED);
 
   Handle<JSStringIterator> NewJSStringIterator(Handle<String> string);
 
   // Allocates an internalized string in old space based on the character
   // stream.
@@ skipping 594 matching lines @@
                                      FunctionMode function_mode);
 
   void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
                                            FunctionMode function_mode);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FACTORY_H_