llvm/test/CodeGen/X86/atomic{32|64}.ll: Unmark them out of XFAIL:win32.

I know it is incorrect and they'd fail with +Asserts for win32 targets, though.
I'll try to fix them tonight.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177914 91177308-0d34-0410-b5e6-96231b3b80d8