public boolean isAdditive() {
        return (flagbyte&FLAG_ADDITIVE)!=0;
    }
Returns true if this relocation is additive.
If this bit is set, then add relocation to existing value.
Otherwise overwrite the existing value.
@return true if this relocation is additive.
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/ne/SegmentRelocation.java