fix unused access to optimise builtin methods which could lead to invalid C code being generated
optimise calls on variables that reference builtin methods (e.g. pre-assigned unbound methods)

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extra : rebase_source : d23e268ce2c1d17e7c9deb14083be1baada2a5b7
fix build

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extra : rebase_source : fd5cd38924cb6b52bd6e902791a2803a16b7bc80
safety fix for analysis in assigned builtin methods optimisation

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extra : rebase_source : 878e5158ff4ceddc3974af6a84f8a2c91eedde6d
fix handler method signature