RFR: 7070: Allow JMC to open compressed recordings with the extension .lz4

[Alex Macdonald]

On Fri, 21 May 2021 12:50:13 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> Many years ago I looked into using multiple file associations for JMC, but it had to work (without conflicts) when using JMC as an Eclipse plug-in as well. I don't think ".lz4" is used in Eclipse + common plug-ins, but it is an aspect to consider.

Thanks for the heads up. I tried using the JMC run configuration for eclipse and plugins, and it seemed to still work okay.

Eclipse:
![eclipse-jmc-lz4](https://user-images.githubusercontent.com/10425301/119168007-73dc2000-ba2e-11eb-9b04-99e3d370425e.png)

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PR: https://git.openjdk.java.net/jmc/pull/250