RFR: JDK-8075816: AliasLevel is broken and should be deprecated

[Tobias Holenstein]

Deprecated AliasLevel and edited help messages.
Added flag to VMDeprecatedOptions test.

Checked that tests are not affected.

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Commit messages:
 - JDK-8075816: AliasLevel is broken and should be deprecated

Changes: https://git.openjdk.java.net/jdk/pull/8140/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8140&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8075816
  Stats: 4 lines in 3 files changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8140.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8140/head:pull/8140

PR: https://git.openjdk.java.net/jdk/pull/8140