RFR: 7201: JdkAttributes.OS_SWITCH_RATE does not work consistently across JFRs from different JDK versions. [v2]

[Suchita Chaturvedi]

> This PR addresses the issue of switchRate attribute not accessible via core API when used for JFR generated with JDK 11 and above.
> 
> Please review the change and provide your valuable comments.

Suchita Chaturvedi has updated the pull request incrementally with one additional commit since the last revision:

  Used JdkTypeId from OracleJdkTypeIDsPre11

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/246/files
  - new: https://git.openjdk.java.net/jmc/pull/246/files/504d8b3f..5a98585c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=246&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=246&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/246.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/246/head:pull/246

PR: https://git.openjdk.java.net/jmc/pull/246