RFR: 8260337: Optimize ImageReader lookup, used by Class.getResource [v2]

[Jim Laskey]

I’ve been handing out the original jimage docs on request. Surprisingly, it’s still accurate.  Will dig up on Monday to post. 

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> On Jan 31, 2021, at 11:07 AM, Alan Bateman <alanb at openjdk.java.net> wrote:
> 
> On Wed, 27 Jan 2021 18:22:54 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:
> 
>>> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
>>> 
>>>  Copyrights and rename containsLocation
>> 
>> Nice clean up. LGTM
> 
> @JimLaskey Do you have anything that documents the jimage format that could be checked into the repo to help with future changes in this change? Clearly any such document would need a warning in 96pt font that the format is JDK internal, submit to change from build to build, etc. but it could be helpful when working on this code.
> 
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> PR: https://git.openjdk.java.net/jdk/pull/2212