rusticl/kernel: add an SVM kernel argument value

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32942>

src/gallium/frontends/rusticl/api/kernel.rs

@@ -489,7 +489,7 @@ fn set_kernel_arg_svm_pointer(
             return Err(CL_INVALID_ARG_INDEX);
         }
 
-        let arg_value = KernelArgValue::Constant(arg_value.to_ne_bytes().to_vec());
+        let arg_value = KernelArgValue::SVM(arg_value);
         kernel.set_kernel_arg(arg_index, arg_value)
     } else {
         Err(CL_INVALID_ARG_INDEX)

src/gallium/frontends/rusticl/core/kernel.rs

@@ -53,6 +53,7 @@ pub enum KernelArgValue {
     None,
     /// cl_ext_buffer_device_address
     BDA(u64),
+    SVM(usize),
     Buffer(Weak<Buffer>),
     Constant(Vec<u8>),
     Image(Weak<Image>),
@@ -1496,6 +1497,11 @@ impl Kernel {
                                     );
                                 }
                             }
+                            &KernelArgValue::SVM(handle) => {
+                                if !api_arg.dead {
+                                    add_pointer(q, &mut input, handle as u64);
+                                }
+                            }
                             KernelArgValue::Image(image) => {
                                 let image = &image_arcs[&(image.as_ptr() as usize)];
                                 let (formats, orders) = if api_arg.kind == KernelArgType::Image {