[patch][rfc] Emit DeferredDeclsToEmit in order

[Rafael Espíndola]

Currently we emit DeferredDeclsToEmit in reverse order. The attached
patch changes that.

The advantages of the change are that

* The output order is a bit closer to the source order. The change to
test/CodeGenCXX/pod-member-memcpys.cpp is a good example.

* If we decide to deffer more, it will not cause as large changes in
the testcases as it would without this patch.

Note that the patch is incomplete. I have to finish updating the
tests, but I wanted to check first if other think this is a good idea
first.

Cheers,
Rafael
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