RFR: JDK-8281462: Annotation toString output for enum not reusable for source input [v2]

[Joe Darcy]

> Two changes to the toString output for annotations to give better source fidelity:
> 
> 1) For enum constants, call their name method rather than their toString method. An enum class can override the toString method to print something other than the name.
> 
> 2) Switch from using binary names (names with "$" for nested types) to canonical names (names with "." with nested types)
> 
> Various existing regression tests are updated to accommodate the changes.
> 
> Please also review the CSR:
> https://bugs.openjdk.java.net/browse/JDK-8281568

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Respond to review feedback.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7418/files
  - new: https://git.openjdk.java.net/jdk/pull/7418/files/fdbfbfea..2989ff11

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7418&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7418&range=00-01

  Stats: 13 lines in 1 file changed: 0 ins; 9 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7418.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7418/head:pull/7418

PR: https://git.openjdk.java.net/jdk/pull/7418