RFR: 8211004: javac is complaining about non-denotable types and refusing to generate the class file

[Vicente Romero]

Please review this fix which is checking if the enclosing class of an anonymous class is denotable or not. Currently javac is failing with an error at class writing time. All this fix is doing is failing during attribution and trying to issue a better error message so that the user knows better how to fix the issue and the position of the offending code,

TIA

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Commit messages:
 - 8211004: javac is complaining about non-denotable types and refusing to generate the class file

Changes: https://git.openjdk.java.net/jdk/pull/6886/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6886&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8211004
  Stats: 21 lines in 8 files changed: 15 ins; 1 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6886.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6886/head:pull/6886

PR: https://git.openjdk.java.net/jdk/pull/6886