RFR: 8264413: Data is written to file header even if its CRC32 was calculated [v4]

[Yi Yang]

On Wed, 31 Mar 2021 16:00:24 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Yi Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add new jtreg test with VerifySharedSpaces
>
> Marked as reviewed by ccheung (Reviewer).

Thanks @calvinccheung @yminqi for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/3261