RFR: 6744: Upgrading to Eclipse RCP 2020-03

[Marcus Hirt]

On Thu, 26 Mar 2020 19:05:24 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>>> I saw a crash. I had MXBean window of JMC itself and a flight recording window of JMC itself (last 5 minutes).
>> 
>> I've had this happen a handful of times for me too; with both OpenJDK11 and OpenJDK8 w/JFR (I'm on Fedora 31 fwiw). I
>> can't recall seeing this with previous Eclipse versions when using the same JDKs.
>> At first I thought the crash was tied to something (it errored when I zoomed into a graph), but the later crashes
>> happened when idle.. usually in the span of 2 to 5 minutes. Nice find.
>
> Interesting. Have you only seen these on Linux?

I'll change this PR to use 2019-12 as default for now, so we can get this in and keep investigating. It also fixes
2019-12 to use the appropriate version of babel, so we at least gain a little something. ;)

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PR: https://git.openjdk.java.net/jmc/pull/69