RFR: 8139457: Array bases are aligned at HeapWord granularity

[Roman Kennke]

On Thu, 17 Nov 2022 12:56:04 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> > I did the zero-ing out up in `allocate_array` since I did not want to affect the object allocation path.
> 
> About that, I see that other platforms zero out the leading bytes in `initialize_body`, but does that not mean that we now do a pointless store whenever we initialize a variable-sized object in +UseCCP mode with 12byte headers?

I don't think so. initialize_object() always passes an aligned offset to initialize_body() because that gap at offset 12 is handled by initialize_header() already.

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PR: https://git.openjdk.org/jdk/pull/11044