Revert "[llvm-objdump] Printing relocations in executable and shared object...

Revert "[llvm-objdump] Printing relocations in executable and shared object files.  This partially reverts r215844 by removing test objdump-reloc-shared.test which stated GNU objdump doesn't print relocations, it does."

This reverts commit r263971.
It produces the wrong results for .rela.dyn. I will add a test.

llvm-svn: 263987