There are several unused symbol definitions in vmSymbols.hpp. For instance, 'newInstance0_name' is unused:
https://github.com/openjdk/jdk/blob/0f8e4e0a81257c678e948c341a241dc0b810494f/src/hotspot/share/classfile/vmSymbols.hpp#L473

There is another reference to 'newInstance0' in a comment in macro.cpp, though.