RFR: 8297602: Compiler crash with type annotation and generic record during pattern matching

[Aggelos Biboudis]

In this PR we erase the annotation in the unhandled case of deconstruction patterns.

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Commit messages:
 - 8297602: Compiler crash with type annotation and generic record during pattern matching

Changes: https://git.openjdk.org/jdk/pull/11532/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11532&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297602
  Stats: 57 lines in 2 files changed: 56 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11532.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11532/head:pull/11532

PR: https://git.openjdk.org/jdk/pull/11532