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runtime: rearrange mheap_.alloc* into allocSpan
This change combines the functionality of allocSpanLocked, allocManual, and alloc_m into a new method called allocSpan. While these methods' abstraction boundaries are OK when the heap lock is held throughout, they start to break down when we want finer-grained locking in the page allocator. allocSpan does just that, and only locks the heap when it absolutely has to. Piggy-backing off of work in previous CLs to make more of span initialization lockless, this change makes span initialization entirely lockless as part of the reorganization. Ultimately this change will enable us to add a lockless fast path to allocSpan. Updates #35112. Change-Id: I99875939d75fb4e958a67ac99e4a7cda44f06864 Reviewed-on: https://go-review.googlesource.com/c/go/+/196641 Run-TryBot: Michael Knyszek <email@example.com> TryBot-Result: Gobot Gobot <firstname.lastname@example.org> Reviewed-by: Austin Clements <email@example.com>
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