Remove ZendArray

SharedMap was the last dependency on ZendArray.  For its localCache,
use a TypedValue[] array indexed by SharedVariant.getIndex(), and
for escalate(mutableIteration), escalate to an HphpArray instead of
a ZendArray.

hphp/runtime/base/array/array_data.cpp

@@ -21,7 +21,6 @@
 #include <runtime/base/builtin_functions.h>
 #include <runtime/base/complex_types.h>
 #include <runtime/base/variable_serializer.h>
-#include <runtime/base/array/zend_array.h>
 #include <runtime/base/runtime_option.h>
 #include <runtime/base/macros.h>
 #include <util/exception.h>