RFR: 8373615: Improve HotSpot debug functions findclass() and findmethod [v4]

[Ioi Lam]

> I used the `findclass` and `findmethod` functions in debug.cpp  a lot when debugging problems with class metadata.
> 
> https://github.com/openjdk/jdk/blob/6ec36d348b1eaeedb993a905e42650242fac0918/src/hotspot/share/utilities/debug.cpp#L583-L603 
> 
> This REF improves these functions by:
> 
> - Sorting the names of classes and methods
> - Allow "." to be used in class names. So both `findclass("java.lang.Object")` and `findclass("java/lang/Object")` would work
> - Print the C++/Java objects that represent classes and methods.

Ioi Lam 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 'master' into 8373615-improve-findclass-and-findmethod
 - Fixed regex test problems on Windows
 - Fixed test and added more test cases
 - sort includes
 - @ashu-mehra and @matias9927 review comments
 - 8373615: Improve HotSpot debug functions findclass() and findmethod

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28796/files
  - new: https://git.openjdk.org/jdk/pull/28796/files/4d40f01e..6649620a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28796&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28796&range=02-03

  Stats: 7538 lines in 283 files changed: 4672 ins; 1009 del; 1857 mod
  Patch: https://git.openjdk.org/jdk/pull/28796.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28796/head:pull/28796

PR: https://git.openjdk.org/jdk/pull/28796