Fix CLoop on big-endian machines

Fix CLoop on big-endian machines

Callee and ScopeChain are JSObject pointers and saved in the 64bit
structure for JS registers. On a 32bit big-endian machine the actual
pointer is offset by the PayloadOffset of 4 bytes, but on little-endian
and 64bit architectures there is no offset.

This patch fixes four places the payloadOffset was not correctly added
on 32bit big-endian, and six places it was added on 64big big-endian
when it shouldn't.

Task-number: QTBUG-41896
Change-Id: I46b474bee9822b8040d1b7b2e8f31ce42e0adefe
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
Gbp-Pq: Name fix_cloop_on_big_endian_machines.patch