RFR: 8308252: Refactor line-by-line file reading code [v3]

[Ioi Lam]

On Wed, 17 May 2023 22:48:15 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixed typo in comments
>
> src/hotspot/share/utilities/lineReader.hpp line 48:
> 
>> 46:   const char* filename() const { return _filename; }
>> 47:   char* get_line();
>> 48:   void close();
> 
> The `close()` doesn't need to be public.

I think it's useful to have a `close()` function that can be called proactively before the LineReader is destroyed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14025#discussion_r1201644804