[clang] [CIR][OpenCL] Add kernel argument metadata attribute (PR #199530)

[David Rivera via cfe-commits]

================
@@ -996,6 +996,10 @@ def CIR_LangAddressSpaceAttr : CIR_EnumAttr<CIR_LangAddressSpace,
   }];
 }
 
+def CIR_LangAddressSpaceArrayAttr
+    : CIR_TypedArrayAttrBase<CIR_LangAddressSpaceAttr,
----------------
RiverDave wrote:

I was initially confused on whether if we should allow target AS to be emitted on the opencl AS descriptor. It seems that is not the case, if you do something wacky like: 

```c
__kernel void foo(__global int *g, __attribute__((address_space(1))) int *t) {}
```

Codegen will ignore the attribute and collapse this to 0 - which is offload_default in CIR's level of abstraction. So this is fine as far as I see.

https://github.com/llvm/llvm-project/pull/199530