when casting a PInt to a primitive for C, we allow PythonNativeVoidPtr to return when we're looking for an 8-byte integer

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/TruffleCextBuiltins.java

@@ -954,6 +954,11 @@ long doLong8(long obj, @SuppressWarnings("unused") int signed, @SuppressWarnings
             return obj;
         }
 
+        @Specialization(guards = "targetTypeSize == 8")
+        Object doVoid(PythonNativeVoidPtr obj, @SuppressWarnings("unused") int signed, @SuppressWarnings("unused") long targetTypeSize) {
+            return obj;
+        }
+
         @Specialization(guards = {"targetTypeSize != 4", "targetTypeSize != 8"})
         int doPInt(@SuppressWarnings("unused") long obj, @SuppressWarnings("unused") int signed, long targetTypeSize) {
             return raiseUnsupportedSize(targetTypeSize);