RFR: 8257162: Initialize ThreadLocalAllocBuffer members

[Thomas Schatzl]

Hi all,

  can I have reviews for this change that adds initialization for all ThreadLocalAllocBuffer members so that when inspecting threads' TLABs the values are not random too?

Testing: tier1,tier2

Thanks,
  Thomas

-------------

Commit messages:
 - Initial import

Changes: https://git.openjdk.java.net/jdk/pull/1458/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1458&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257162
  Stats: 21 lines in 1 file changed: 21 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1458.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1458/head:pull/1458

PR: https://git.openjdk.java.net/jdk/pull/1458