[Rev 01] RFR: 6704: More information when opening an LZ4 compressed recording

[Marcus Hirt]

> Since LZ4 works great when compressing flight recordings, we should at least warn if LZ4 compressed recordings are encountered.
> 
> (We will eventually support it in JMC 8, but this warning should be back ported to JMC 7.)

The pull request has been updated with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Added commits:
 - 08934669: Merge branch 'master' into lz4aware
 - 28d203af: 6657: Add allocation pressure column to Memory and TLAB views

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/62/files
  - new: https://git.openjdk.java.net/jmc/pull/62/files/f4c001f0..08934669

Webrevs:
 - full: https://webrevs.openjdk.java.net/jmc/62/webrev.01
 - incr: https://webrevs.openjdk.java.net/jmc/62/webrev.00-01

  Stats: 237 lines in 13 files changed: 168 ins; 6 del; 63 mod
  Patch: https://git.openjdk.java.net/jmc/pull/62.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/62/head:pull/62

PR: https://git.openjdk.java.net/jmc/pull/62