Summary:
Currently, we assign this to private memory. This causes failures on
some SOLLVE tests. The standard isn't clear on the semantics of this
allocation type, but there seems to be a consensus that it's supposed to
be shared memory.
Summary:
The 'omp_alloc' function should be callable from a target region. This
patch implemets it by simply calling `malloc` for every non-default
trait value allocator. All the special access modifiers are
unimplemented and return null. The null allocator returns null as the
spec states it should not be usable from the target.