RFR: 8286559: Re-examine synchronization of mark and reset methods on InflaterInputStream

[Jaikiran Pai]

Can I please get a review of this change that addresses https://bugs.openjdk.java.net/browse/JDK-8286559? 

The commit here removes the `synchronized` on `mark` and `reset` methods of `InflaterInputStream`. The `mark` method is a no-op method and the `reset` method only always throws a `IOException`. So `synchronized` isn't adding any value here. 

Additionally, the commit does a minor change to the javadoc of these methods to use `@implNote` to describe what the implementation does. Please let me know if the `@implNote` is unnecessary, in which case, I'll revert that part.

This change is similar to what was recently done for `FilterInputStream` https://github.com/openjdk/jdk/pull/8309 and `PushbackInputStream` https://github.com/openjdk/jdk/pull/8433

tier1, tier2 and tier3 tests were run and no related failures were noticed.

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Commit messages:
 - 8286559: Re-examine synchronization of mark and reset methods on InflaterInputStream

Changes: https://git.openjdk.java.net/jdk/pull/8649/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8649&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286559
  Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8649.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8649/head:pull/8649

PR: https://git.openjdk.java.net/jdk/pull/8649