Add support for --section-data/section-relocations/section-symbols to llvm-readelf

[jh7370]

Bugzilla Link	42522
Version	trunk
OS	Windows NT
CC	@jh7370

Extended Description

--section-data, --section-relocations, and --section-symbols are all llvm-readobj switches that print additional information when dumping section headers. They are currently ignored in llvm-readelf. It would be nice if they could do something useful in llvm-readelf too when combined with --sections. I don't have any specific suggestions.