RFR: 8344355: Register corruption in MacroAssembler::lookup_secondary_supers_table_var: x86-64 only

[Martin Buchholz]

On Mon, 25 Nov 2024 15:27:22 GMT, Andrew Haley <aph at openjdk.org> wrote:

> This bug only affects x86-64 machines without a `popcnt` instruction, which basically means pre-SSE4.2 machines. This means that x86-64 processors made around 2010 are affected.
> 
> My thanks to everyone who was was involved in bisecting this, particularly Martin Bucholz who seems to be the only one testing on such old hardware.

Patch tested on MacBook Air 3,1

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Marked as reviewed by martin (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/22365#pullrequestreview-2459411078