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Decode (cloned) StackSnapshot in ghc-heap

Sven Tennie requested to merge wip/decode_cloned_stack into master

This MR adds stack (frame) closures and related decoding to ghc-heap. In the past it was impossible to decode RTS stacks, because they are highly volatile. This changed with the introduction of StackSnapshot which represents a cloned (offline, inactive, frozen) stack.

A good entry point for the reviewer is Note [Decoding the stack].

Edited by Sven Tennie

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