pypy first LLP64 issue

diff -r df2a94c7ae6f rpython/rtyper/lltypesystem/rffi.py
--- a/rpython/rtyper/lltypesystem/rffi.py	Sat May 06 19:38:18 2017 +0100
+++ b/rpython/rtyper/lltypesystem/rffi.py	Wed May 10 14:19:30 2017 +0100
@@ -1075,7 +1075,7 @@
         return size
     if (tp is lltype.Signed or isinstance(tp, lltype.Ptr) 
                             or tp is llmemory.Address):
-        return LONG_BIT/8
+        return r_intptr_t.BITS/8
     if tp is lltype.Char or tp is lltype.Bool:
         return 1
     if tp is lltype.UniChar: