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

[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.

In executable and shared object ELF files, relocations in the file contain the final virtual address rather than section offset so this is adjusted to display section offset.

Differential revision: http://reviews.llvm.org/D15965

llvm-svn: 263971