Add `withMVarMasked` (re #8818)
Like `withMVar`, but the @IO@ action in the second argument is executed
with asynchronous exceptions masked. This completes the `MVar` API,
which already contained `modifyMVarMasked` and `modifyMVarMasked_`.
Signed-off-by:
Herbert Valerio Riedel <hvr@gnu.org>
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