RFR: 8341832: Incorrect continuation address of synthetic SIGSEGV for APX in product builds

[Jatin Bhateja]

- Enable APX EGPRs state save restoration check which triggers synthetic SIGSEGV and verifies modified EGPRs state across OS signal handling for non-product builds to match with [corresponding logic in signal handlers.](https://github.com/openjdk/jdk/blob/master/src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp#L251)

- Currently we haven't enabled APX support in product builds and intend to do so once entire planned support ([JDK-8329030](https://bugs.openjdk.org/browse/JDK-8329030)) is validated and checked into JDK-mainline, we are following incremental development approach for APX and hence don't want partial APX support to be enabled in intermediate releases.

Kindly review.

Best Regards,
Jatin

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Commit messages:
 - 8341832: Incorrect continuation address of synthetic SIGSEGV for APX in product builds

Changes: https://git.openjdk.org/jdk/pull/21419/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21419&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341832
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21419.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21419/head:pull/21419

PR: https://git.openjdk.org/jdk/pull/21419