RFR: 8295657: SA: Allow larger object alignments

[Aleksey Shipilev]

On Wed, 19 Oct 2022 13:03:53 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Looks fine. Curious, how well are all these alignments tested? E.g. do they work with all GCs?

I tested `serviceability/sa` with default (G1) and all acceptable alignments, seems to work fine. We can run the tests with other GCs, if anyone wants it.

> test/hotspot/jtreg/serviceability/sa/TestObjectAlignment.java line 84:
> 
>> 82:         SATestUtils.skipIfCannotAttach(); // throws SkippedException if attach not expected to work.
>> 83:         if (args == null || args.length == 0) {
>> 84:             for (int align = 8; align <= 256; align *= 2) {
> 
> Alternatively, no loop, six test sections, hand in alignment via program arg, and be able to do all this in parallel?

The test seems short, so I opted for simplicity.

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PR: https://git.openjdk.org/jdk/pull/10762