8329748: Change default value of AssertWXAtThreadSync to true

[tobiasholenstein]

The debug flag -XX:+AssertWXAtThreadSync conservatively checks for correct W^X thread state at possible safepoints or handshake. The flag is useful to detect missing MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));. Since the check is cheap and it is a AARCH64_ONLY(develop(..)) only flag it makes sense to enable the flag by default.

There was one missing MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread)); to make all tests (tier1-7) pass.

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Progress

• [x] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue

Issue

• JDK-8329748: Change default value of AssertWXAtThreadSync to true (Enhancement - P4)

Reviewers

• Vladimir Kozlov (@vnkozlov - Reviewer)
• Richard Reingruber (@reinrich - Reviewer)

Reviewing

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