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rts: Clear block_info when unblocking

Ben Gamari requested to merge wip/clear-block-info into master

Here we ensure that StgTSO.block_info is cleared to a valid sentinel value when a thread is unblocked. This voids dangling pointers which can complicate debugging.

This was originally in !10375 (closed) but removed due to a now-fixed Windows issue.

Edited by Ben Gamari

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