JDK 9 currently ships debuginfo as a separate bundle:
   http://jre.us.oracle.com/java/re/jdk/9/latest/bundles/linux-x64/jdk-9_linux-x64_bin-symbols.tar.gz

For each $LIBNAME share library,
   Linux, Solaris - it contains one $LIBNAME.debuginfo file
   Windows it contains a paired $LIBNAME.map and $LIBNAME.pdb file
   OSX - it contains $LIBNAME.dylib.dSYM

In jake, the JDK build by default generates $LIBNAME.diz file zipping up the debug symbols. Hence a pair of shared library + .diz file are packaged in jmod file.

Need to decide where and how debuginfo should be packaged
1) JMOD file
2) JDK image build
3) Release bundles