OpenACC 3.3-NEXT has changed the way tags for copy, copyin, copyout, and
create clauses are specified, and end up adding a few extras, and
permits them as a list. This patch encodes these as bitmask enum so
they can be stored succinctly, but still diagnose reasonably.
OpenACC PR 475(targetting OpenACC3.4) added support for the _Pragma
spelling of an OpenACC pragma. We already implemented this, as clang
doesn't really differentiate between the spellings (so we did it as an
inadvertent extension).
This patch adds a few spot-check tests to make sure we support this
spelling and that it results in the same AST as the traditional
spelling.
The 'declare' construct is the first of two 'declaration' level
constructs, so it is legal in any place a declaration is, including as a
statement, which this accomplishes by wrapping it in a DeclStmt. All
clauses on this have a 'same scope' requirement, which this enforces as
declaration context instead, which makes it possible to implement these
as a template.
The 'link' and 'device_resident' clauses are also added, which have some
similar/small restrictions, but are otherwise pretty rote.
This patch implements all of the above.
