Fix llvm-readobj tests on big endian hosts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179298 91177308-0d34-0410-b5e6-96231b3b80d8
Revert my last two commits while I debug what is wrong in a big endian host.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179303 91177308-0d34-0410-b5e6-96231b3b80d8