[lworld] RFR: 8281618: Add asmtools sources as a test library [v2]

[David Simms]

On Thu, 10 Feb 2022 23:56:23 GMT, Dan Smith <dlsmith at openjdk.org> wrote:

>> This is mostly a direct copy of the asmtools repo. The one interesting file is JtregDriver, which avoids various complications involved in directly invoking the asmtools 'Main' entry point.
>
> Dan Smith has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
> 
>  - Merge branch 'lworld' into asmtools
>  - Fix trailing whitespace
>  - Added usage comment
>  - Generalize JtregDriver for all asmtools commands
>  - Add JtregDriver to provide an entry point that doesn't call System.exit
>  - Add asmtools source to test/lib

There is not a good way of adding Valhalla features still in prototyping without having a Valhalla specific copy...looks good

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Marked as reviewed by dsimms (Committer).

PR: https://git.openjdk.java.net/valhalla/pull/646