RFR: 8338693: assert(Atomic::add(&ik->_shared_class_load_count, 1) == 1) failed: shared class loaded more than once

[Matias Saavedra Silva]

The test vmTestbase/nsk/sysdict/vm/stress/chain/chain007/chain007.java  occasionally fails due to the number of shared classes being incremented even though the shared class is not loaded. This patch moves the assert to only increment once loading is possible.

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Commit messages:
 - Merge branch 'master' into shared_load_count_8338693
 - 8338693: assert(Atomic::add(&ik->_shared_class_load_count, 1) == 1) failed: shared class loaded more than once

Changes: https://git.openjdk.org/jdk/pull/20955/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20955&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338693
  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20955.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20955/head:pull/20955

PR: https://git.openjdk.org/jdk/pull/20955