RFR: 6657: Add allocation pressure column to Memory and TLAB views

[Jie Kang]

On Tue, 3 Mar 2020 19:15:05 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> I agree with the naming suggestions and have updated the PR with a commit to match them, rebasing onto latest upstream as well.
>
> ![image](https://user-images.githubusercontent.com/16906077/75810822-97646d80-5d8b-11ea-8ec6-bd8facf8406e.png)
> 
> A little bit more default room for the Outside TLAB columns and we're good to go! :)

I've updated the default widths. When testing I made sure to clean the jmc cache (on Linux @ ~/.jmc) so the defaults would be seen. The intent is that the columns should have enough space for their title.

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PR: https://git.openjdk.java.net/jmc/pull/21