disable multi_add for Intel due to likely driver bug

Author: jeffbolznv

ggml/src/ggml-vulkan/ggml-vulkan.cpp

@@ -3571,6 +3571,7 @@ static vk_device ggml_vk_get_device(size_t idx) {
         device->multi_add = vk12_props.shaderRoundingModeRTEFloat16 &&
                             device->properties.limits.maxPushConstantsSize >= sizeof(vk_op_multi_add_push_constants) &&
                             vk12_features.runtimeDescriptorArray &&
+                            device->vendor_id != VK_VENDOR_ID_INTEL &&
                             getenv("GGML_VK_DISABLE_MULTI_ADD") == nullptr;
 
         if (device->subgroup_size_control) {
@@ -10704,12 +10705,12 @@ static bool ggml_vk_can_fuse(const struct ggml_cgraph * cgraph, int node_idx, st
 
 static uint32_t ggml_vk_fuse_multi_add(ggml_backend_vk_context * ctx, const struct ggml_cgraph * cgraph, int node_idx) {
 
-    if (!ctx->device->multi_add) {
+    const ggml_tensor *first_node = cgraph->nodes[node_idx];
+    if (first_node->op != GGML_OP_ADD) {
         return 0;
     }
 
-    const ggml_tensor *first_node = cgraph->nodes[node_idx];
-    if (first_node->op != GGML_OP_ADD) {
+    if (!ctx->device->multi_add) {
         return 0;
     }