RFR: 8307352: AARCH64: Improve itable_stub [v8]

[Evgeny Astigeevich]

On Mon, 28 Aug 2023 13:41:35 GMT, Boris Ulasevich <bulasevich at openjdk.org> wrote:

> By the way, [assembler_aarch64.hpp](https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/aarch64/assembler_aarch64.hpp) contains 100+ assert calls and 34 guarantee calls. I think more cases can be changed, although I am not sure what the rule is for using this or that call.

A JBS issue?

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PR Review Comment: https://git.openjdk.org/jdk/pull/13792#discussion_r1308308257