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This change removes a hack which was added to deal with Darwin 10.10's
weird ignorance of mapping hints which would cause race mode to fail
since it requires the heap to live within a certain address range.

We no longer support 10.10, and this is potentially causing problems
related to the page allocator, so drop this code.

Updates #26475.
Updates #35112.

Change-Id: I0e1c6f8c924afe715a2aceb659a969d7c7b6f749
Reviewed-on: https://go-review.googlesource.com/c/go/+/205757


Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>