Revert "Fix aligned allocation availability XFAILs after D56445."

This reverts commit r351625.

That fix was incomplete. I'm reverting so I can commit a complete fix
in a single revision.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351669 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed