Use higher level functions in llvm-objdump.

This matches the rest of llvm-objdump better and isolates it from upcoming
changes to ELFFile.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244500 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed