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Currently the scavenging tests implicitly assume that the system huge
page size is always strictly less than 4 MiB, or pallocChunkBytes. This
leads to failures on systems with huge pages of this size, and larger.

Filter out those tests on such platforms and add a test for the 4 MiB
case. The scavenger is already equipped to handle this case.

Huge page sizes > 4 MiB are effectively ignored, so also add a test case
to ensure that happens.

Unfortunately we can't actually run these tests in our CI because they
require the platform to provide the right huge page size, but we really
should just parameterize this value so we can test it (there's a TODO
about this already).

Fixes #42053.

Change-Id: Ia576cbf67e178a14a178a893967efbed27d6eb17
Reviewed-on: https://go-review.googlesource.com/c/go/+/263837
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
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