PATCH: more efficient raidz memory usage for (gpt)zfsboot

[Matt Reimer]

Teach the (gpt)zfsboot and zfsloader raidz code to use its buffers
more efficiently.

Before this patch, in the worst case memory use would increase
exponentially on the number of drives in the raidz vdev.

Sponsored by: VPOP Technologies, Inc.

Matt Reimer
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