[jdk11u-dev] RFR: 8314220: Configurable InlineCacheBuffer size

[Ekaterina Vergizova]

I'd like to backport JDK-8314220 to 11u.
It allows to configure IC buffer size to avoid multiple ICBufferFull safepoints and possible performance degradation.

17u patch applies almost cleanly except for:
- minor context difference in icBuffer.cpp
- different method for experimental flag declaration in globals.hpp (JDK-8243208 is not in 11u)
The changes reapplied manually.

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Commit messages:
 - Backport a40d8d97e84d88d1a65aba81bfc09339be95e427

Changes: https://git.openjdk.org/jdk11u-dev/pull/2498/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2498&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314220
  Stats: 11 lines in 4 files changed: 8 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2498.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2498/head:pull/2498

PR: https://git.openjdk.org/jdk11u-dev/pull/2498