RFR: 8323497: On x64, use 32-bit immediate moves for narrow klass base if possible [v5]

[Aleksey Shipilev]

On Thu, 22 May 2025 12:59:50 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Well, every little bit counts.

`0.6..1.0%` improvement in code density is great for such a small change. This is why I want it sooner :)

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PR Comment: https://git.openjdk.org/jdk/pull/17340#issuecomment-2901191074