[clang] [clang][SYCL] Implement address space attributes for SYCL (PR #200849)

[Tom Honermann via cfe-commits]

================
@@ -4,16 +4,22 @@
 
 #ifdef __SYCL_DEVICE_ONLY__
----------------
tahonermann wrote:

I think the SYCL attributes are desired for both host and device compilation.

```suggestion
#ifdef SYCL_LANGUAGE_VERSION
```

https://github.com/llvm/llvm-project/pull/200849