Integrate CoCo patch

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http://code.google.com/p/lua-alchemy/issues/detail?id=53

Issues: 

1. License on the __asm__ parts of code is not clear (they are taken from
the Alchemy-generated code).

2. We need to keep Lua pristine by default, so the patch must be optional.

Original issue reported on code.google.com by [email protected] on 27 Dec 2008 at 10:56