SA has the following source directory:

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/debugger/proc

However, there are no references to any classes in this directory. There used to be a reference to ProcDebuggerLocal, but this reference was removed, along with the class, when solaris support was removed by JDK-8244224. There appears to be no other need for anything in this directory now, and I believe it can be safely removed.