fix: perform send channel action for select #665
Merged
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The CFG was wrong for select send comm clauses. If an init operation
on channel was required (like a derefence, index operation, ...) it
was skipped. The bug was invisible in case of a local var channel.
A send channel init operation consist to prepare both the data to
send (right subtree of send AST) and the channel itself (left
subtree of send AST). All channel init operation must be performed
prior to call select.
Fixes #647.