RFR: 8276337: Use override specifier in HeapDumper

Fri Nov 5 13:09:10 UTC 2021

On Fri, 5 Nov 2021 11:32:24 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> Use override specifier in HeapDumper. It is safer.

I have some new code in the pipe, and I want to use `override` in that code without changing unrelated code in heapDumper.cpp. Thus I first make this change so that my future change can keep the "style" of the file.

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PR: https://git.openjdk.java.net/jdk/pull/6274