Add benchmark for 32 bit repeated fields.

The previous benchmark did not cover 32 bit fields, and was unrealistically biased towards perfect multiples of 32.

PiperOrigin-RevId: 588532175

src/google/protobuf/wire_format_unittest.cc

@@ -11,11 +11,15 @@
 
 #include "google/protobuf/wire_format.h"
 
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
 #include "google/protobuf/unittest.pb.h"
 #include "google/protobuf/unittest_mset.pb.h"
 #include "google/protobuf/unittest_mset_wire_format.pb.h"
 #include "google/protobuf/unittest_proto3_arena.pb.h"
-#include <gmock/gmock.h>
+#include "google/protobuf/wire_format_lite.h"
 #include <gtest/gtest.h>
 
 #define UNITTEST ::protobuf_unittest