[llvm-readobj] - Inline a few yaml inputs into test cases.

[llvm-readobj] - Inline a few yaml inputs into test cases.

There are some test that are splitted into main part + input yaml for no visible reason.
This patch inines the yaml part for the 3 test cases I found.

Differential revision: https://reviews.llvm.org/D63644

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364049 91177308-0d34-0410-b5e6-96231b3b80d8