RFR: CODETOOLS-7903165: change -encoding option to use ASCII instead of ISO8859 [v2]

[Iris Clark]

On Mon, 16 May 2022 18:20:21 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review a trivial change to replace use of `-encoding ISO8859-1` (in various forms) to `-encoding ASCII`
>
> Jonathan Gibbons has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
> 
>  - Merge with upstream master
>  - CODETOOLS-7903165: change -encoding option to use ASCII instead of ISO8859

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/jtreg/pull/76