RFR: 8374744: Enable dumping of APX EGPRs (R16–R31) in JVM fatal error logs [v2]

[Sandhya Viswanathan]

On Thu, 29 Jan 2026 21:48:13 GMT, Srinivas Vamsi Parasa <sparasa at openjdk.org> wrote:

>> The goal of this PR is to add support for printing the values of APX extended general-purpose registers (EGPRs, R16-R31) in hs_err_pid* crash logs on x86 platforms with APX support. The implementation detects APX support at runtime and attempts to dump the additional registers when available, improving post-mortem debugging capabilities.
>
> Srinivas Vamsi Parasa has updated the pull request incrementally with one additional commit since the last revision:
> 
>   undo verbose code to print registers; repalce it with for loop

Looks good to me.

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Marked as reviewed by sviswanathan (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29098#pullrequestreview-3725285147