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8.8 - dirty MVAR after mutating TSO queue head

vdukhovni requested to merge trac-vdukhovni/ghc:putMVar-tso-queue-gc-8.8 into ghc-8.8

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.

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