[test/Object] - Move/rewrite 2 more test cases.

This patch makes a change for test/Object tests responsible
for relocations.

* 2 tests were moved to llvm-readobj/llvm-objdump folders:
Object/elf-reloc-no-sym.test -> tools/llvm-readobj/elf-reloc-no-sym.test
Object/objdump-reloc-shared.test -> tools/llvm-objdump/relocations-in-nonreloc.test

* A prerecompiled binary was removed and these tests were refactored.

Differential revision: https://reviews.llvm.org/D66291

llvm-svn: 369342