RFR: 8319598: SMFParser misinterprets interrupted running status

[Jan Trukenmüller]

The MIDI file parser misinterprets events without status byte when they appear directly after a Meta of SysEx event.

For my bugfix I had to decide between two possible solutions:
- Strict solution: Throw an InvalidMidiDataException
- Tolerant solution: Use the status of the last channel event as running status

I used the tolerant solution.
I will send an email to the list client-libs-dev with my reasons.

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Commit messages:
 - 8319598: Fixed incorrect interpretation of interrupted running status in SMFParser

Changes: https://git.openjdk.org/jdk/pull/16546/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16546&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319598
  Stats: 121 lines in 2 files changed: 118 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/16546.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16546/head:pull/16546

PR: https://git.openjdk.org/jdk/pull/16546