RFR: 8252889: C2 crashes when disabling InsertMemBarAfterArraycopy

[Tobias Hartmann]

The InsertMemBarAfterArraycopy product flag (enabled by default) is broken. I propose to simply remove it.
The corresponding CSR (JDK-8252890) is still waiting for approval.

Thanks,
Tobias

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Commit messages:
 - 8252889: C2 crashes when disabling InsertMemBarAfterArraycopy

Changes: https://git.openjdk.java.net/jdk/pull/69/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=69&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252889
  Stats: 17 lines in 3 files changed: 1 ins; 15 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/69.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/69/head:pull/69

PR: https://git.openjdk.java.net/jdk/pull/69