RFR: 8271186: Add UL option to replace newline char [v4]

[Yasumasa Suenaga]

On Tue, 24 Aug 2021 18:20:49 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Yasumasa Suenaga 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 seven additional commits since the last revision:
>> 
>>  - Update UL help message and manpage
>>  - Merge remote-tracking branch 'upstream/master' into JDK-8271186
>>  - Fix test on Windows
>>  - Implement as foldmultilines
>>  - Merge remote-tracking branch 'upstream/master' into JDK-8271186
>>  - add inclusion of os.hpp
>>  - 8271186: Add UL option to replace newline char
>
> I tested the latest version in our CI pipeline and all tests in tiers 1-2 passed.

Thanks @iklam and @dholmes-ora ! I was relieved to hear my PR passed your CI pipeline.

I updated help message and manpage. I will update `foldmultilines` handling after the discussion if it needs.

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PR: https://git.openjdk.java.net/jdk/pull/4885