RFR: 8270179: Rename Amalloc_4

[Kim Barrett]

On Mon, 12 Jul 2021 08:23:55 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> My guess would be that the only widely relevant 32bit architecture was x86, and they allow unaligned access. I wonder how 32bit arm handles this. Maybe allocating 32bit words of memory is just very rare.

Maybe using a given arena for a mix of operations doesn't happen?  If only Amalloc is used for an arena then it will stay 8 byte aligned.

> I honestly always thought Amalloc4 was for allocating 32bits, if you knew 32bit alignment was enough. E.g. for storing ints. But seems I was wrong all along.

That's what I would have guessed too, based on the name.  That's why I complained about it.

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PR: https://git.openjdk.java.net/jdk/pull/4750