class DynamicNeededObserver

This can be used for invoking a callback over every DT_NEEDED tag, passed

as a string. Getting the string value requires that the SymbolInfo object

be already set up. In practice this means that DynamicNeededObserver

cannot safely be passed to DecodeDynamic with DynamicSymbolInfoObserver

because there is no expectation that DT_STRTAB will appear before DT_NEEDED.

It's the expectation that this would be used only once, just when loading

dependencies, which is likely only going to happen after getting

the symbol and relocation info of the current dso, so the cost of this

restricition isn't high.