@Override
	public int typeId() {
		return typeId;
	}
Calculates the offset of the variable relative
to the start of the TLS block that contains the 
variable.  The computed value is used as an
immediate value of an addend and is not associated
with a specific register.
Ghidra/Processors/x86/src/main/java/ghidra/app/util/bin/format/elf/relocation/X86_64_ElfRelocationType.java