[erlang-patches] Move let expressions into sequences

[Anthony Ramine]

Hello,

The Core Erlang compiler simplifies let expressions by moving them into their argument when it is another let or a case expression. It can then perform other optimizations such as removing the let expressions altogether, sometimes saving BEAM registers later in the process.

This patch teaches sys_core_fold how to move let expressions into sequence arguments.

	git fetch https://github.com/nox/otp.git move-let-into-seq

	https://github.com/nox/otp/compare/erlang:maint...move-let-into-seq
	https://github.com/nox/otp/compare/erlang:maint...move-let-into-seq.patch

For the record, I managed to encounter this while working on the file optimization in branch file-receive-optim. You can find a short file showing seq in let in the following gist:

	https://gist.github.com/nox/2e33fe9a85e035caadda#file-t-core-L14
	https://gist.github.com/nox/2e33fe9a85e035caadda#file-t-erl

Regards,

-- 
Anthony Ramine