nir: track existence of variable shared memory

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19855>

src/compiler/shader_info.h

@@ -513,6 +513,11 @@ typedef struct shader_info {
           */
          enum gl_derivative_group derivative_group:2;
 
+         /*
+          * If the shader might run with shared mem on top of `shared_size`.
+          */
+         bool has_variable_shared_mem:1;
+
          /**
           * pointer size is:
           *   AddressingModelLogical:    0    (default)

src/compiler/spirv/spirv_to_nir.c

@@ -6499,6 +6499,9 @@ vtn_emit_kernel_entry_point_wrapper(struct vtn_builder *b,
    for (unsigned i = 0; i < entry_point->num_params; ++i) {
       struct vtn_type *param_type = b->entry_point->func->type->params[i];
 
+      b->shader->info.cs.has_variable_shared_mem |=
+         param_type->storage_class == SpvStorageClassWorkgroup;
+
       /* consider all pointers to function memory to be parameters passed
        * by value
        */