RFR: JDK-8318119: Invalid narrow Klass base on aarch64 post 8312018

[Andrew Haley]

On Fri, 3 Nov 2023 14:37:36 GMT, Andrew Haley <aph at openjdk.org> wrote:

> Why not do the optimized (for AArch64) stuff before trying the immediate + shift?

For AArch64, the optimum is zero base, no shift, then immediate base, no shift, then shift, and last of all immediate + shift.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16215#discussion_r1381794815