mheap use pageAlloc to manage free/scav address space instead of
using free/scav treap. The comment on mheap states mheap uses
treaps. Update the comment to reflect the use of pageAlloc.
In the fallback code when sizeSpecializedMalloc is enabled,
heapBitsInSpan is false. Update the comment to reflect that.
Change-Id: I50d2993c84e2c0312a925ab0a33065cc4cd41c41
Reviewed-on: https://go-review.googlesource.com/c/go/+/722700 Reviewed-by: Lidong Yan <yldhome2d2@gmail.com> Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com>