8152911: javac assertion error when compiling overlay sources Summary: Avoid creating ModuleSymbols with unspecified name, to avoid conflicts with predefined ModuleSymbol for the java.base module. Reviewed-by: jjg

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.hgtip
^.bridge2
^.jib/
.DS_Store
.metadata/
.recommenders/