[jdk11u-dev] RFR: 8255452: Doing GC during JVMTI MethodExit event posting breaks return oop

[Martin Doerr]

Almost clean backport of "8255452: Doing GC during JVMTI MethodExit event posting breaks return oop". Old 11u code uses IRT_ENTRY instead of JRT_ENTRY, but they have the same implementation.

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Commit messages:
 - Backport 3a02578b333758db841cb6b9058f6fe064107881

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/110/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=110&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255452
  Stats: 58 lines in 3 files changed: 42 ins; 12 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/110.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/110/head:pull/110

PR: https://git.openjdk.java.net/jdk11u-dev/pull/110