RFR: 8284930: Re-examine FilterInputStream mark/reset [v2]

[Brian Burkhalter]

> Remove the `synchronized` keyword from the `mark(int)` and `reset()` methods of `java.io.FilterInputStream`.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8284930: Also remove synchronized keyword from mark() and reset() of InputStream

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8309/files
  - new: https://git.openjdk.java.net/jdk/pull/8309/files/85546c9e..f210cbf5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8309&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8309&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8309.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8309/head:pull/8309

PR: https://git.openjdk.java.net/jdk/pull/8309