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Re: Fix PR tree-optimization/28778, 29156, and 29415
The other patches would have been about 50% memory consumption
increase, and about 30-50% compile time slowdown (yeah, those are real
numbers, the number of vops just goes ballistic).
Try the attached and let me know if it helps please!
I'll bootstrap and regtest this in the meanwhile, and if it succeeds,
commit it (it can *only* be a win, reducing the number of nonlocal
vars, so ...).