RFR: 6542: Improve calls to render in the flame view [v20]

[Miroslav Wengner]

On Fri, 9 Oct 2020 20:11:01 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Miroslav Wengner has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   6542: more cleanup
>
> Changes requested by hirt (Lead).

found the issue. better to open a new branch

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PR: https://git.openjdk.java.net/jmc/pull/78