[llvm-readobj][test] - Remove amdgpu-elf-definitions.test
amdgpu-elf-definitions.test is a file that tests
Format, 'OS/ABI' and 'Machine' fields printed for EM_AMDGPU.
It uses a precompiled object.
It is not needed to have it, because:
- We already test formats in file-header-format.test + llvm/unittests/Object/ELFObjectFileTest.cpp.
- We test 'OS/ABI' in file-header-os-abi.test for all possible values.
- We test machine types in file-header-machine-types.test
In addition we have amdgpu-elf-headers.test which tests EM_AMDGPU specific flags. I.e.
it also tests the fact that llvm-readobj/elf are able to dump such objects.
This patch removes the test case and the corresponding binary.
Differential revision: https://reviews.llvm.org/D86774