Improve "llvm-nm -f sysv" output for Elf files

Improve "llvm-nm -f sysv" output for Elf files

Specifically, compute and Print Type and Section columns.

This is a re-commit of rL354833, after fixing the Asan problem found a a buildbot.

Differential Revision: https://reviews.llvm.org/D59060

llvm-svn: 355742