RFR: 8261675: ObjectValue::set_visited(bool) sets _visited false [v2]

[Xin Liu]

> The setter is error-prone. it unconditionally sets _visited false.
> this patch stores the argument to it.

Xin Liu has updated the pull request incrementally with one additional commit since the last revision:

  8261675: ObjectValue::set_visited(bool) sets _visited false
  
  use getter and setter of _visited.
  update the year of copyright.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2560/files
  - new: https://git.openjdk.java.net/jdk/pull/2560/files/2d512adc..dce5bbf2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2560&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2560&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2560.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2560/head:pull/2560

PR: https://git.openjdk.java.net/jdk/pull/2560