runtime: clean up mheap.allocLarge
mheap.allocLarge just calls bestFitTreap and is the only caller of bestFitTreap. Flatten these into a single function. Also fix their comments: allocLarge claims to return exactly npages but can in fact return a larger span, and h.freelarge is not in fact indexed by span start address. Change-Id: Ia20112bdc46643a501ea82ea77c58596bc96f125 Reviewed-on: https://go-review.googlesource.com/47315 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org>
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