[llvm\test\Object] - An initial step to cleanup the test cases.

This patch removes trivial-object-test.elf-i386,
trivial-object-test.elf-x86-64 and trivial-object-test2.elf-x86-64
precompiled objects from test/Object/Inputs folder.

I adjusted the existent test cases to use YAML instead.

Differential revision: https://reviews.llvm.org/D64206

llvm-svn: 365348