public long getAddend() {
		return r_addend;
	}
This member specifies the RELA signed-constant addend used to compute 
the value to be stored into the relocatable field.  This
value will be 0 for REL entries which do not supply an addend and may
rely on an implicit addend stored at the relocation offset.
See {@link #hasAddend()} which is true for RELA / Elf_Rela and false
for REL / Elf_Rel relocations.
@return addend as 64-bit signed constant
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/elf/ElfRelocation.java