javadoc crashes: class cast exception com.sun.tools.javac.code.Symtab$6

javadoc crashes: class cast exception com.sun.tools.javac.code.Symtab$6

Bug: https://github.com/openjdk/jdk/pull/17435
Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1057500
Applied-Upstream: commit, 64c3642c57719940855b220025b33758950b3980
Last-Update: 2024-01-24

Javadoc option '--ignore-source-errors' allows generating Javadoc for the packages
that contain compilation errors.
jdk.javadoc.internal.doclets.toolkit.util.ClassTree generates a type hierarchy
for javadoc that may include error types such as class Foo extends Bar {}
where Bar is undefined.
The user still wants to generate documentation for Foo and have Bar as a text label.
For the unknown class Bar it is impossible to detect the enclosing class/file and
javadoc crashes with an exception.

Gbp-Pq: Name jdk-8242564.patch