Replace coff-/elf-dump with llvm-readobj

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179361 91177308-0d34-0410-b5e6-96231b3b80d8
Remove obsolete object file dumpers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179362 91177308-0d34-0410-b5e6-96231b3b80d8
Teach llvm-readobj to print ELF program headers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179363 91177308-0d34-0410-b5e6-96231b3b80d8