RFR: 8227745, 8233915: Enable Escape Analysis for Better Performance in the Presence of JVMTI Agents

[Richard Reingruber]

Hi,

this is the continuation of the review of the implementation for:

https://bugs.openjdk.java.net/browse/JDK-8227745
https://bugs.openjdk.java.net/browse/JDK-8233915

It allows for JIT optimizations based on escape analysis even if JVMTI agents acquire capabilities to access references
to objects that are subject to such optimizations, e.g. scalar replacement. The implementation reverts such
optimizations just before access very much as when switching from JIT compiled execution to the interpreter, aka
"deoptimization".

Webrev.8 was the last one before before the transition to Git/Github:

http://cr.openjdk.java.net/~rrich/webrevs/8227745/webrev.8/

Thanks, Richard.

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Commit messages:
 - 8227745, 8233915: Enable Escape Analysis for Better Performance in the Presence of JVMTI Agents

Changes: https://git.openjdk.java.net/jdk/pull/119/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=119&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8227745
  Stats: 5390 lines in 47 files changed: 5266 ins; 23 del; 101 mod
  Patch: https://git.openjdk.java.net/jdk/pull/119.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/119/head:pull/119

PR: https://git.openjdk.java.net/jdk/pull/119