[llvm] [OpenMP][Offload] Handle non-memberof `present/to/from` entries irrespective of order. (PR #165494)

[Robert Imschweiler via llvm-commits]

ro-i wrote:

> We don't have to worry about cases like map(alloc: a[0:4]) map(to: a[1]) since OpenMP guarantees that the two list-items should be identical in this case.

Hm, is this also true if the alloc map exists due to an implicit mapping?

https://github.com/llvm/llvm-project/pull/165494