Export of internal Abseil changes.

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ee644a89fb1429d9337852690a01182853f68964 by Derek Mauro <dmauro@google.com>:

Lower the thread limit in the Mutex benchmark on some platforms.
#147

PiperOrigin-RevId: 205663768
GitOrigin-RevId: ee644a89fb1429d9337852690a01182853f68964
Change-Id: Ic5db4061809aa65f73e6a63dba90b2554376b38c

absl/synchronization/mutex_benchmark.cc

@@ -74,11 +74,11 @@ void BM_ConditionWaiters(benchmark::State& state) {
   mu.Unlock();
 }
 
-#ifdef THREAD_SANITIZER
-// ThreadSanitizer can't handle 8192 threads.
-constexpr int kMaxConditionWaiters = 2048;
-#else
+// Some configurations have higher thread limits than others.
+#if defined(__linux__) && !defined(THREAD_SANITIZER)
 constexpr int kMaxConditionWaiters = 8192;
+#else
+constexpr int kMaxConditionWaiters = 1024;
 #endif
 BENCHMARK(BM_ConditionWaiters)->RangePair(0, 2, 1, kMaxConditionWaiters);