RFR: 8278923: Document Klass::is_loader_alive [v2]

[Coleen Phillimore]

> This trivial change just adds a comment to Klass::is_loader_alive.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Fix typo.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9400/files
  - new: https://git.openjdk.org/jdk/pull/9400/files/d3ab126a..f5701a34

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9400&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9400&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9400.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9400/head:pull/9400

PR: https://git.openjdk.org/jdk/pull/9400