ProGuard sometimes generates invalid signatures

[satsen]

https://bugs.openjdk.org/browse/JDK-8341608

Chen Liang
A bug in the preexisting com.sun.tools.classfile library used by jdeps 22 permitted parsing of the broken signature Lscala/collection/immutable/TreeMap$TreeMapBuilder<TA;TB;>.;, while the ClassFile API correctly identifies that the consecutive period and semicolon is an invalid pattern. This is a bug in the proguard optimizer, which produces invalid signatures.