Remove set but unused variables

Some compilers catch that these are unused:

 tcmalloc/testing/reclaim_test.cc:157:11: error: variable 'iter' set but not used [-Werror,-Wunused-but-set-variable]
   157 |       int iter = 0;
       |           ^
 1 error generated.

Remove them.

PiperOrigin-RevId: 641919386
Change-Id: I49753b1ec892a5db43445958013fb53ed7fb5f43

tcmalloc/testing/realized_fragmentation_test.cc

@@ -157,7 +157,6 @@ TEST(RealizedFragmentation, Accuracy) {
   void* small_list_keep = nullptr;
   int kept = 0;
   void* small_list_free = nullptr;
-  int freed = 0;
 
   for (size_t total = 0; total < kSmallTarget; total += kSmallSize) {
     void* object = ::operator new(kSmallSize);
@@ -166,7 +165,6 @@ TEST(RealizedFragmentation, Accuracy) {
       kept++;
     } else {
       SLL_Push(&small_list_free, object);
-      freed++;
     }
   }
 

tcmalloc/testing/reclaim_test.cc

@@ -154,9 +154,7 @@ TEST(ReclaimTest, ReclaimStable) {
         TC_CHECK(!tcmalloc_internal::subtle::percpu::IsFastNoInit());
       }
 
-      int iter = 0;
       while (!sync->load(std::memory_order_acquire)) {
-        iter++;
         for (int i = 0, num_cpus = tcmalloc_internal::NumCPUs(); i < num_cpus;
              ++i) {
           MallocExtension::ReleaseCpuMemory(i);