RFR: 8358694: VM asserts if CodeCacheSegmentSize is not a power of 2 [v8]

[Amit Kumar]

> Makes sure that JVM exits gracefully when `CodeCacheSegmentSize` is not a power of 2.

Amit Kumar has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains nine commits:

 - Merge branch 'master' into codecache
 - remove string check & update copyright header
 - updates testcase
 - remove whitespace
 - fix comment
 - add test case
 - fix
 - move the changes in flag constraints specific file
 - make jvm exit gracefully

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Changes: https://git.openjdk.org/jdk/pull/25708/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25708&range=07
  Stats: 85 lines in 2 files changed: 84 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25708.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25708/head:pull/25708

PR: https://git.openjdk.org/jdk/pull/25708