nir/peephole_select: don't include nir_search_helpers.h

Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33590>

src/compiler/nir/nir_opt_peephole_select.c

@@ -25,7 +25,6 @@
 #include "nir.h"
 #include "nir_builder.h"
 #include "nir_control_flow.h"
-#include "nir_search_helpers.h"
 
 /*
  * Implements a small peephole optimization that looks for