RFR: 8277748: Obsolete the MinInliningThreshold flag in JDK 19

[Emanuel Peter]

Changed `MinInliningThreshold` from `Depricated` (for JDK 18) to `Obsolete` (for JDK 19).

Checked that tests are not affected.

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Commit messages:
 - 8277748: Obsolete the MinInliningThreshold flag in JDK 19

Changes: https://git.openjdk.java.net/jdk/pull/6986/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6986&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277748
  Stats: 15 lines in 3 files changed: 1 ins; 14 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6986.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6986/head:pull/6986

PR: https://git.openjdk.java.net/jdk/pull/6986