public static CstProtoRef make(CstString descriptor) {
    Prototype prototype = Prototype.fromDescriptor(descriptor.getString());
    return new CstProtoRef(prototype);
  }
Makes an instance for the given value. This may (but does not necessarily) return an
already-allocated instance.

@param descriptor the method descriptor
@return {@code non-null;} the appropriate instance
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/cst/CstProtoRef.java