RFR: JDK-8267041: javac crash when creating lambda with capture inside a switch expression

[Jan Lahoda]

Variables declared inside switch expressions used as initializers to fields have the field as their owner. We need to make sure they are captured by `LambdaToMethod` - there were a few places where the checks were missing, leading to a crash later during code generation.

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Commit messages:
 - JDK-8267041: javac crash when creating lambda with capture inside a switch expression

Changes: https://git.openjdk.java.net/jdk/pull/4012/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4012&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267041
  Stats: 125 lines in 2 files changed: 123 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4012.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4012/head:pull/4012

PR: https://git.openjdk.java.net/jdk/pull/4012