RFR: 8309196: Remove Thread.countStackFrames

[Alan Bateman]

Thread.countStackFrames is/was an ill-defined method that dates from JDK 1.0 for counting the stack frames of a suspended Thread. The method was deprecated in JDK 1.2 (1998), deprecated for removal in Java 9, and re-specified/degraded to throw UOE unconditionally in Java 14.  Java 22 would be a fine time to finally remove this method.

Code that wants to count stack frames should be directed to use j.l.StackWalker, or if is a a tool, then it can use JVM TI and other tool APIs.

A corpus analysis of 30M classes in 131k artifacts from Maven Central found only 1 usages to this method. The 1 usage appears to be a class that just wraps all methods, it doesn't actually make use of it.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/14257/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14257&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309196
  Stats: 20 lines in 2 files changed: 0 ins; 17 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/14257.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14257/head:pull/14257

PR: https://git.openjdk.org/jdk/pull/14257