Fix compile warning [-Wtype-limits]

src/heap/heap.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 4812 matching lines @@
     case MAP_SPACE:
       return map_space_->Contains(addr);
     case LO_SPACE:
       return lo_space_->SlowContains(addr);
   }
   UNREACHABLE();
   return false;
 }
 
 
+bool Heap::IsValidAllocationSpace(AllocationSpace space) {
+  switch (space) {
+    case NEW_SPACE:
+    case OLD_SPACE:
+    case CODE_SPACE:
+    case MAP_SPACE:
+    case LO_SPACE:
+      return true;
+    default:
+      return false;
+  }
+}
+
+
 bool Heap::RootIsImmortalImmovable(int root_index) {
   switch (root_index) {
 #define CASE(name)               \
   case Heap::k##name##RootIndex: \
     return true;
     IMMORTAL_IMMOVABLE_ROOT_LIST(CASE);
 #undef CASE
     default:
       return false;
   }
@@ skipping 1710 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8