clover: bind sampler_t type to module::argument::sampler

Reviewed-by: Pierre Moreau <dev@pmoreau.org>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4974>

src/gallium/frontends/clover/llvm/codegen/common.cpp

@@ -134,6 +134,11 @@ namespace {
                               target_size, target_size,
                               target_align, module::argument::zero_ext);
 
+         } else if (type_name == "sampler_t") {
+            args.emplace_back(module::argument::sampler, arg_api_size,
+                              target_size, target_align,
+                              module::argument::zero_ext);
+
          } else if (type_name == "__llvm_image_size") {
             // Image size implicit argument.
             args.emplace_back(module::argument::scalar, sizeof(cl_uint),