[llvm-readobj] Dump SFrame relocations as well (#153161)
If there is a relocation for a particular FDE, print it as well. This is
mainly meant for human consumption (otherwise, there's no way to tell
which function a given (relocatable) FDE refers to). For testing of
relocation generation, I'd still recommend using the regular relocation
dumper, as this code will not detect (e.g.) any superfluous relocations.
I've considered handling relocations inside the SFrameParser class, but
I couldn't find an elegant way to do that. Right now, I don't have a use
case for resolving relocations there as lldb (my other use case for
SFrameParser) will always operate on linked objects.
