RFR: JDK-8261297: NMT: Final report should use scale 1

[Thomas Stuefe]

On Mon, 8 Feb 2021 08:15:21 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> If PrintNMTStatistics is specified, we write a NMT report to stdout before exiting the VM. This is useful for leak analysis.
> 
> However, the report uses the standard "K" scale, which is shouldn't, since this omits small leaks < 1K. Hence it should use scale=1. This would provide us with a precise exit report. Note that for this to work JDK-8261238 has to be fixed too, which is a separate issue.
> 
> This patch:
> - changes the scale of the final report to 1
> - does some minor cleanup work in the MemReporter class hierarchy (const-ifying scale and the output stream, and establishing 0 as "default scale" as to avoid having the default scale hard coded in four places.

@zhengyu123 , are you okay with this?

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PR: https://git.openjdk.java.net/jdk/pull/2450