RFR: 8376106: TestObjectDescription.java intermittent fails Unable to replace class name [v2]

[Robert Toyonaga]

> This change prevents the counter from overflowing. 
> 
> ### Problem:
> The counter overflows at 2002 iterations because on each iteration the retry loop calls `testClassLoader.loadClasses(OldObjects.MIN_SIZE / 20)`. 
> `OldObjects.MIN_SIZE` = 99901 , so 99901 / 20 = 4995 classes are loaded each iteration.
> 
> The constructed `className` must be exactly the same length as "TestClass0000000". Which means the max number of classes loaded can be 9,999,999. After 2002 iterations we hit the limit (2002 * 4995 = 9,999,990).
> 
> ### Solution
> 
> Making `classIdCounter`  non-`static` forces the counter to reset with each iteration of `TestObjectDescription.asseertObjectDescription`. The maximum value of the counter is now 4995, so it cannot possibly overflow no matter how long it takes to collect the leak samples. 
> 
> Testing:
> - Re-running the test 60 times never results in overflow.

Robert Toyonaga has updated the pull request incrementally with one additional commit since the last revision:

  Add -XX:-UseTLAB to make sampling more reliable. Whitespace.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29945/files
  - new: https://git.openjdk.org/jdk/pull/29945/files/ec0ec648..66977dc1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29945&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29945&range=00-01

  Stats: 14 lines in 2 files changed: 1 ins; 1 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/29945.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29945/head:pull/29945

PR: https://git.openjdk.org/jdk/pull/29945