[libc++] Update the list of symbols exported from libc++abi for new/delete
When libc++ does not provide new/delete, libc++abi now also provides the
aligned allocation and deallocation functions, so those should be part of
the re-export list for libc++.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@356804 91177308-0d34-0410-b5e6-96231b3b80d8
Louis Dionne