[wasm] Remove raw byte pointers from WasmModule

src/vector.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_VECTOR_H_
 #define V8_VECTOR_H_
 
 #include <string.h>
 #include <algorithm>
 
@@ skipping 15 matching lines @@
 
   template <int N>
   explicit Vector(T (&arr)[N]) : start_(arr), length_(N) {}
 
   static Vector<T> New(int length) {
     return Vector<T>(NewArray<T>(length), length);
   }
 
   // Returns a vector using the same backing storage as this one,
   // spanning from and including 'from', to but not including 'to'.
-  Vector<T> SubVector(int from, int to) {
+  Vector<T> SubVector(int from, int to) const {
     DCHECK(0 <= from);
     SLOW_DCHECK(from < to);
     SLOW_DCHECK(static_cast<unsigned>(to) <= static_cast<unsigned>(length_));
     return Vector<T>(start() + from, to - from);
   }
 
   // Returns the length of the vector.
   int length() const { return length_; }
 
   // Returns whether or not the vector is empty.
@@ skipping 160 matching lines @@
 
 template <typename T, int N>
 inline Vector<T> ArrayVector(T (&arr)[N]) {
   return Vector<T>(arr);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_VECTOR_H_