RFR: 8273584: TypeElement.getSuperclass crashes for a record TypeElement when j.l.Record is not available

[Jan Lahoda]

After JDK-8273263, calling TypeElement.getSuperclass may fail on a record when j.l.Record is not available, because the method will try to synthesize the type based on treee, but the tree is not filled. The proposal is to fill in the tree.

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Commit messages:
 - 8273584: TypeElement.getSuperclass crashes for a record TypeElement when j.l.Record is not available

Changes: https://git.openjdk.java.net/jdk/pull/5465/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5465&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273584
  Stats: 122 lines in 2 files changed: 120 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5465.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5465/head:pull/5465

PR: https://git.openjdk.java.net/jdk/pull/5465