[SYCL] IVDep: Add support for struct members and pointers

[erichkeane]

Struct members was missed in the initial implementation, we just need to
properly handle the MemberExpr when doing our SEMA (+ consider it in a
few other places).

Pointers should be allowed, since the arrays decay to pointer pretty
easily in the type system. The implementation is as simple as allowing
it in Sema, then making sure we pass the Decl to the GEP creation
function.

[smanna12]

Thanks Erich for the support.

[Fznamznon]

@MrSidims , could you please take a look?

[MrSidims]

LGTM

[AGindinson]

Nice one, thanks Erich!
Taking this further, is there a way to allow all operator[] implementers (like cl::sycl::accessor) into the attribute's arguments? Or am I missing something and it's already facilitated by the pointer-supporting code?

[erichkeane]

Nice one, thanks Erich!
Taking this further, is there a way to allow all operator[] implementers (like cl::sycl::accessor) implementers into the attribute's arguments? Or am I missing something and it's already facilitated by the pointer-supporting code?

There isn't really. If an attribute isn't something that modifies the type, the source code itself has no way to get to the attribute. What you CAN do is make the attribute and the code both get the argument the same way, such as a single constant expression that they both reference.