llvm/test/CodeGen/X86/win_ftol2.ll: Add -cpu=generic to appease valgrind.

On valgrind the processor is reported;
  Host CPU: athlon-fx

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172983 91177308-0d34-0410-b5e6-96231b3b80d8