RFR: 8283298: Make CodeCacheSegmentSize a product flag [v3]

[Jie Fu]

> Hi all,
> 
> As discussed in https://github.com/openjdk/jdk/pull/7830, this patch makes `CodeCacheSegmentSize` a product flag.
> It also fixes two bugs when testing the release VM with CodeEntryAlignment={512, 1024}.
> Please review it.
> 
> Thanks.
> Best regards,
> Jie

Jie Fu has updated the pull request incrementally with one additional commit since the last revision:

  Fix the comment

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7851/files
  - new: https://git.openjdk.java.net/jdk/pull/7851/files/af65cbaa..4d6c11e6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7851&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7851&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7851.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7851/head:pull/7851

PR: https://git.openjdk.java.net/jdk/pull/7851