RFR: 8293667: Align jlink's --compress option with jmod's --compress option

[Ian Graves]

On Mon, 9 Jan 2023 21:38:59 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> I skimmed through this (not a detailed review) and I think it's mostly okay. It's --compress 0 and 2 that should be listed as deprecated as --compress 1 is string sharing rather than zip compression.
>
>> I skimmed through this (not a detailed review) and I think it's mostly okay. It's --compress 0 and 2 that should be listed as deprecated as --compress 1 is string sharing rather than zip compression.
> 
> I also think it's good to deprecate the old values.   I think we can separate the StringSharingPlugin as a separate plugin option (e.g. `--compact-constant-pools`) and deprecate --compress 1 as well.   Something like this:
> 
> 
>   --compress <compress>               Compression to use in compressing resources:
>                                         Accepted values are:  
>                                         zip-[0-9], where zip-0 provides no  
>                                         compression, and zip-9 provides the 
>                                         best compression. Default is zip-6.
>                                         Deprecated values:
>                                         0:  No compression. Equivalent to zip-0.
>                                         1:  Equivalent to --compact-constant-pools
>                                         2:  Equivalent to zip-6.

Added additional changes per @mlchung 's suggestions. Thanks!

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PR: https://git.openjdk.org/jdk/pull/11617