[foreign-memaccess+abi] Integrated: Remove specialized zero-lenght mapped segment

[Per Minborg]

On Tue, 14 Feb 2023 15:37:49 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to remove the specialized zero-length MappedMemorySegment.

This pull request has now been integrated.

Changeset: 96dedbe9
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/panama-foreign/commit/96dedbe93d1a4209104c8d15dafef672beef5823
Stats:     46 lines in 4 files changed: 13 ins; 25 del; 8 mod

Remove specialized zero-lenght mapped segment

Reviewed-by: mcimadamore

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PR: https://git.openjdk.org/panama-foreign/pull/793