[X86] Fix test checks script to satisfy pyflakes

- Remove unused imports.
- Initialize the variable 'name' before its (static) uses, and rename it to a
  more descriptive name.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286128 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed