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9.0 - dirty MVAR after mutating TSO queue head

vdukhovni requested to merge trac-vdukhovni/ghc:putMVar-tso-queue-gc-9.0 into ghc-9.0

This patch adds a missing "dirty_MVAR" call to 3 similar variants of putMVar, resolving #18919 (closed). Identical to !4557 (closed) which is the 8.10 version.

Edited by vdukhovni

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