RFR: 8287840: Dead copy region node blocks IfNode's fold-compares

[Xin Liu]

8287840: Dead copy region node blocks IfNode's fold-compares

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Commit messages:
 - Update copyright year.
 - 8287840: Dead copy region node blocks IfNode's fold-compares

Changes: https://git.openjdk.java.net/jdk/pull/9035/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9035&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287840
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9035.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9035/head:pull/9035

PR: https://git.openjdk.java.net/jdk/pull/9035