RFR: 8363620: AArch64: reimplement emit_static_call_stub()

[Dean Long]

On Tue, 5 Aug 2025 11:45:18 GMT, Fei Gao <fgao at openjdk.org> wrote:

> Unaligned memory access may be non-atomic, although in this case, other threads aren’t modifying the data.

I thought other threads are modifying the data, which is the reason why we needed the ISB.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26638#discussion_r2255414513