Make BitsetType enum uint32_t to avoid narrowing warnings

src/types.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_TYPES_H_
 #define V8_TYPES_H_
 
 #include "src/conversions.h"
 #include "src/factory.h"
 #include "src/handles.h"
@@ skipping 612 matching lines @@
 
 
 // -----------------------------------------------------------------------------
 // Bitset types (internal).
 
 template<class Config>
 class TypeImpl<Config>::BitsetType : public TypeImpl<Config> {
  protected:
   friend class TypeImpl<Config>;
 
-  enum {
+  enum : uint32_t {
     #define DECLARE_TYPE(type, value) k##type = (value),
     BITSET_TYPE_LIST(DECLARE_TYPE)
     #undef DECLARE_TYPE
     kUnusedEOL = 0
   };
 
   static bitset SignedSmall();
   static bitset UnsignedSmall();
 
   bitset Bitset() { return Config::as_bitset(this); }
@@ skipping 507 matching lines @@
   bool Narrows(BoundsImpl that) {
     return that.lower->Is(this->lower) && this->upper->Is(that.upper);
   }
 };
 
 typedef BoundsImpl<ZoneTypeConfig> Bounds;
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPES_H_