RFR: CODETOOLS-7903317: Fix code to compile extra property definitions

[Daniel Jeliński]

On Fri, 16 Sep 2022 19:00:31 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a fairly simple update to eliminate false positives in comments when looking for the name of the class in a Java source file.
> 
> The fix addresses a performance issue when running tests, because the "extra property definition" files were compiled every time jtreg was run, instead of as needed, which is the intent.
> 
> The fix is to ignore comments in the source code. The code to do this is copied from equivalent functionality in the langtools `ToolBox` class, which has been in use for many years.
> 
> The existing tests for "extra property definition" files have been extended with a test case to ensure that the false positives no longer occur and that the files are not recompiled unnecessarily.
> 
> Minor style issues in the main source file have also been fixed.

Marked as reviewed by djelinski (no project role).

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PR: https://git.openjdk.org/jtreg/pull/122