RFR: 8376287: Crashes when using -XX:ObjArrayMarkingStride=0 [v2]

[Guanqiang Han]

> Please review this change, it addresses a trivial issue. Thanks!
> 
> **Description:**
> 
> This is a trivial issue caused by the invalid value of -XX:ObjArrayMarkingStride=0, which results in a division by zero in the PartialArrayTaskStepper::start() method.
> https://github.com/openjdk/jdk/blob/2529e2fe8dfe9685033bb0ae558266b8bc3cf95c/src/hotspot/share/gc/shared/partialArrayTaskStepper.inline.hpp#L39-L40
> 
> **Fix:**
> 
> Restrict the ObjArrayMarkingStride to positive values.
> 
> **Test:**
> 
> GHA

Guanqiang Han has updated the pull request incrementally with one additional commit since the last revision:

  remove unused assert

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29479/files
  - new: https://git.openjdk.org/jdk/pull/29479/files/107cecff..6662176e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29479&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29479&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29479.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29479/head:pull/29479

PR: https://git.openjdk.org/jdk/pull/29479