RFR: 8356648: runtime/Thread/AsyncExceptionTest.java fails with +StressCompiledExceptionHandlers

[Dean Long]

The test fails (or times out) because Runtime1::counter_overflow offers a safepoint, allowing async exceptions, but there is no exception handler for the out-of-line slow path call to Runtime1::counter_overflow.  Rather than add an exception handler, the simple fix is to replace JRT_BLOCK with JRT_BLOCK_NO_ASYNC so that counter_overflow doesn't need to deal with async exceptions.  The GC poll point for backwards branches is sufficient to allow async exceptions.
I also improved the test so that it fails more quickly rather than waiting forever and eventually timing out, and added a C1-specific run using -XX:+StressCompiledExceptionHandlers.

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Commit messages:
 - improve test
 - use JRT_BLOCK_NO_ASYNC

Changes: https://git.openjdk.org/jdk/pull/25375/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25375&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356648
  Stats: 36 lines in 2 files changed: 9 ins; 11 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/25375.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25375/head:pull/25375

PR: https://git.openjdk.org/jdk/pull/25375