RFR: 8325074: ZGC fails assert(index == 0 || is_power_of_2(index)) failed: Incorrect load shift: 11

[Roberto Castañeda Lozano]

On Thu, 15 Feb 2024 07:08:50 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> `ZBarrierSet::clone_obj_array` incorrectly treats the payload of an ObjArray as `[base, obj + size[`. With non standard object alignment (`ObjectAlignmentInBytes`) there may be padding words at the end. 
> 
> Change `ZBarrierSet::clone_obj_array` to instead use `[base, base + length[` as the payload.

Marked as reviewed by rcastanedalo (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17863#pullrequestreview-1882181420