libclc: clspv: do not set generic_addrspace_val

[rjodinchr]

This is breaking clspv: google/clspv#1493

[rjodinchr]

@frasercrmck could you please review?

[frasercrmck]

Sorry about that.

Just to confirm this will work like nvptx, so it will report that the generic address space is available but won't generate certain generic functions (because it's identical to the private address space).

If we get round to adding proper support for generic atomic builtins you'd still get generic versions of those (with AS0) because there's no private address space to clash with. That's not happening right now but I thought I should make you aware.

[rjodinchr]

While libclc is not generating the generic functions, they exist in clang. Thus clspv gets them from there, they are just not prefixed with __clc_. Later in clspv flow, we map them to the proper function using some inlining to figure out the exact addrspace.

Could you please merge this PR as I cannot do it myself? Thank you