RFR: 8366787: Test runtime/StackGuardPages/TestStackGuardPagesNative.java hangs on some platforms

[mazhen]

#### Summary

This PR fixes a hang in the `TestStackGuardPagesNative.java` test that occurs on certain Linux distributions (e.g., CentOS 7). The fix replaces an unbounded `for(;;)` loop in the native test code (`exeinvoke.c`) with a bounded `while` loop, making the test's behavior deterministic and robust across all platforms.

#### Problem

The test would hang and eventually time out on some platforms. This was caused by an unbounded `for(;;)` loop in the `do_overflow` function, which was introduced as part of the "hardening" fix in `JDK-8295344`.

*   On platforms like **CentOS 7**, this unbounded loop would not encounter a terminating signal in a timely manner, causing the native process to hang indefinitely until killed by the test harness.
*   In contrast, on platforms like **Ubuntu 24**, the test would coincidentally pass because a `SEGV_MAPERR` would happen to terminate the loop. This highlighted that the test's success was reliant on platform-specific side effects, masking the underlying issue.

#### Solution

The solution is to replace the unbounded `for(;;)` loop with a bounded `while` loop. The condition `while (_kp_rec_count == 0 || _rec_count < _kp_rec_count)` ensures that the loop terminates deterministically after a specific number of allocations, corresponding to the overflow depth detected in the test's first phase.

This change makes the test's logic robust and its behavior consistent across different environments.

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Commit messages:
 - 8366787: runtime/StackGuardPages/TestStackGuardPagesNative.java hangs on some platforms

Changes: https://git.openjdk.org/jdk/pull/27114/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27114&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366787
  Stats: 8 lines in 2 files changed: 0 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27114.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27114/head:pull/27114

PR: https://git.openjdk.org/jdk/pull/27114