[llvm] [NVPTX] Basic support for "grid_constant" (PR #96125)

[Justin Lebar via llvm-commits]

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@@ -2475,6 +2475,7 @@ defm cvta_local  : NG_TO_G<"local", int_nvvm_ptr_local_to_gen, useShortPtrLocal>
 defm cvta_shared : NG_TO_G<"shared", int_nvvm_ptr_shared_to_gen, useShortPtrShared>;
 defm cvta_global : NG_TO_G<"global", int_nvvm_ptr_global_to_gen, False>;
 defm cvta_const  : NG_TO_G<"const", int_nvvm_ptr_constant_to_gen, useShortPtrConst>;
+defm cvta_param : NG_TO_G<"param", int_nvvm_ptr_param_to_gen, False>;
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jlebar wrote:

```suggestion
defm cvta_param  : NG_TO_G<"param", int_nvvm_ptr_param_to_gen, False>;
```

https://github.com/llvm/llvm-project/pull/96125