Do not block JIT with pending_stale_p

Because we want to flush pending stale units before unloading units, the
pending_stale_p check is implemented in this waiting loop.

However, once all methods are called more than --jit-min-calls,
mjit_worker_wakeup will not be signaled again. As a result, when
mjit_recompile is called after that and pending_stale_p becomes true,
MJIT stops processing methods in the unit queue even if the queue is
very long and MJIT does nothing, waiting for the signal.

There should be a better way to handle this, but as a fix to be
backported to Ruby 3.0, let me make an obvious simple commit here.

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