[libcxx] Remove outdated XFAILs for aligned deallocation

AppleClang 10 has been fixed and so these tests don't fail anymore.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@350736 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed