RFR: 8365975: Sort share/memory includes

[Francesco Andreuzzi]

This PR sorts the includes in `hotspot/share/memory` using `SortIncludes.java`. I'm also adding the directory to `TestIncludesAreSorted`, and removing a couple of unnecessary include statements.

Passes `tier1`.

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Commit messages:
 - nn
 - revert
 - sort

Changes: https://git.openjdk.org/jdk/pull/26897/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26897&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365975
  Stats: 23 lines in 14 files changed: 11 ins; 10 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26897.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26897/head:pull/26897

PR: https://git.openjdk.org/jdk/pull/26897