RFR: JDK-8293711: Factor out size parsing functions from arguments.cpp [v2]

[Thomas Stuefe]

On Wed, 21 Sep 2022 05:20:01 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   feedback johan
>
> Changes requested by stefank (Reviewer).

@stefank @dholmes-ora @jdksjolen is the new version acceptable?

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PR: https://git.openjdk.org/jdk/pull/10252