RFR: 8298278: JFR: Turn MEMFLAGS into a type for use with the NativeMemoryUsage events

[Erik Gahlin]

Hi,

Could I have review of change that creates a type for MEMFLAGS

Testing: tier1,tier2, jdk/jdk/jfr/*

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/12541/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12541&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298278
  Stats: 33 lines in 6 files changed: 23 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/12541.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12541/head:pull/12541

PR: https://git.openjdk.org/jdk/pull/12541