Split functions which use blockaddresses normally

[yotann]

In the normal case, function @f may have blockaddresses stored in global constant @g, which is only used by function @f. The obvious solution in this case is to put @g in the split module along with @f.

In the general case, blockaddresses for function @f may be used by other functions, but this should be extremely rare and we don't need to handle it well.