RFR: 8371141: Shenandoah: Many test timeouts with -XX:-UseTLAB

[Kelvin Nilsen]

Problem list no-tlab versions of tests that fail after integration of https://github.com/openjdk/jdk/pull/26867

We expect the small regression (increase) in time spent holding the global heap log will be counterbalanced by resolution of https://bugs.openjdk.org/browse/JDK-8361099, which performs shared (no-tlab) allocations without acquiring the global heap lock.

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Commit messages:
 - Problem list no-tlab versions of TestSieve and TestRetain

Changes: https://git.openjdk.org/jdk/pull/28133/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28133&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371141
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28133.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28133/head:pull/28133

PR: https://git.openjdk.org/jdk/pull/28133