Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/src/property-details.h b/src/property-details.h
index 44f32cb..fdf2c6c 100644
--- a/src/property-details.h
+++ b/src/property-details.h
@@ -56,9 +56,7 @@
 
 
 class Smi;
-template<class> class TypeImpl;
-struct ZoneTypeConfig;
-typedef TypeImpl<ZoneTypeConfig> Type;
+class Type;
 class TypeInfo;
 
 // Type of properties.
@@ -332,6 +330,7 @@
   bool IsReadOnly() const { return (attributes() & READ_ONLY) != 0; }
   bool IsConfigurable() const { return (attributes() & DONT_DELETE) == 0; }
   bool IsDontEnum() const { return (attributes() & DONT_ENUM) != 0; }
+  bool IsEnumerable() const { return !IsDontEnum(); }
   PropertyCellType cell_type() const {
     return PropertyCellTypeField::decode(value_);
   }