Add the `BM_EraseEmplace` benchmark that constantly adds and removes the same element.

PiperOrigin-RevId: 591987002
Change-Id: Ic1ed2063aeb95a6e814eefcbed024e1a5a1d8d2f

absl/container/internal/raw_hash_set_benchmark.cc

@@ -14,6 +14,8 @@
 
 
 #include <array>
 #include <array>
 #include <cmath>
 #include <cmath>
+#include <cstddef>
+#include <cstdint>
 #include <numeric>
 #include <numeric>
 #include <random>
 #include <random>
 #include <tuple>
 #include <tuple>
@@ -205,6 +207,22 @@ void CacheInSteadyStateArgs(Benchmark* bm) {
 }
 }
 BENCHMARK(BM_CacheInSteadyState)->Apply(CacheInSteadyStateArgs);
 BENCHMARK(BM_CacheInSteadyState)->Apply(CacheInSteadyStateArgs);
 
 
+void BM_EraseEmplace(benchmark::State& state) {
+  IntTable t;
+  int64_t size = state.range(0);
+  for (int64_t i = 0; i < size; ++i) {
+    t.emplace(i);
+  }
+  while (state.KeepRunningBatch(size)) {
+    for (int64_t i = 0; i < size; ++i) {
+      benchmark::DoNotOptimize(t);
+      t.erase(i);
+      t.emplace(i);
+    }
+  }
+}
+BENCHMARK(BM_EraseEmplace)->Arg(1)->Arg(2)->Arg(4)->Arg(8)->Arg(16)->Arg(100);
+
 void BM_EndComparison(benchmark::State& state) {
 void BM_EndComparison(benchmark::State& state) {
   StringTable t = {{"a", "a"}, {"b", "b"}};
   StringTable t = {{"a", "a"}, {"b", "b"}};
   auto it = t.begin();
   auto it = t.begin();