RFR: JDK-8276983: Small fixes to DumpAllocStat::print_stats

[Ioi Lam]

On Thu, 11 Nov 2021 06:15:32 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> When looking at CDS code in the context of Lilliput, I had to spend some time in DumpAllocStat::print(). I noticed two small things which can be fixed independently:
> 
> - the divide-by-zero check at lines 45ff is not needed, since `percent_of` does this already. It also can cause the asserts at the end of the function to fire wrongly.
> 
> - About those asserts: it makes sense to flush the debug message before scope end, otherwise, we won't see the debug message if the asserts fire. If they fire, the debug message would be helpful.
> 
> I also improved the assert message somewhat. I noticed that all sizes in this method are `int`, but left it that way because changing it would have too many ripple effects. I guess we won't get CDS archives beyond int_max any time soon.
> 
> Thanks, Thomas

LGTM. Good clean up.

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6347