3265

Ah, the reason commit 3258 broke chessboard.mu was that I forgot to
migrate the implementation of 'switch' to 'wait-for-routine-to-block'.
That caused these cascading effects when running chessboard.mu:

a) 'read-event' from real keyboard calls 'switch'

b) 'switch' waits for some other currently running routine to *complete*
rather than just block

c) deadlock unsurprisingly ensues

This was hard to debug because I kept searching for occurrences of
'wait-for-routine' that I'd missed, and didn't realize that 'switch' too
was a form of 'wait-for-routine'. No more; now it's a form of
'wait-for-routine-to-block', possibly the *only* reason to ever call
that instruction outside of tests.

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