Emily Bellows e3d638a49e C backend: while, struct tests, better undefined global handling ...

1. Function signatures that return a no member struct return void
2. Undefined var decls don't get a value generated for them
3. Don't generate bitcast code if the result isn't used, since
   bitcast is a pure function. Right now struct handling code
   generates some weird unused bitcast AIR, and this optimization
   side steps that issue.

2021-11-08 14:23:55 -05:00

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