Print reasonable representations of type names in llvm-nm, readelf and readobj

Print reasonable representations of type names in llvm-nm, readelf and readobj

For type values that do not have proper names, print reasonable representation
in llvm-nm, llvm-readobj and llvm-readelf, matching GNU tools.s

Fixes PR41713.

Differential Revision: https://reviews.llvm.org/D65537

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368451 91177308-0d34-0410-b5e6-96231b3b80d8