Unify comments style

- Change /* comments */ to // comments
- Re-generate auto-generated files
- Remove legacy unused GEMMINC SSE micro-kernels

PiperOrigin-RevId: 271901989
diff --git a/src/xnnpack/conv.h b/src/xnnpack/conv.h
index c1bdec3..efc2634 100644
--- a/src/xnnpack/conv.h
+++ b/src/xnnpack/conv.h
@@ -59,5 +59,5 @@
 
 
 #ifdef __cplusplus
-} /* extern "C" */
+}  // extern "C"
 #endif