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

[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.

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Commit messages:
 - 8373615: Improve HotSpot debug functions findclass() and findmethod

Changes: https://git.openjdk.org/jdk/pull/28796/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28796&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373615
  Stats: 100 lines in 2 files changed: 90 ins; 4 del; 6 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