- Fix a lot of warnings generated by -Wshorten-64-to-32

runtime/platform/thread_macos.cc

Index: runtime/platform/thread_macos.cc
===================================================================
--- runtime/platform/thread_macos.cc	(revision 38492)
+++ runtime/platform/thread_macos.cc	(working copy)
@@ -297,10 +297,14 @@
   } else {
     struct timespec ts;
     int64_t secs = micros / kMicrosecondsPerSecond;
+    if (secs > kMaxInt32) {
+      // Avoid truncation of overly large timeout values.
+      secs = kMaxInt32;
+    }
     int64_t nanos =
         (micros - (secs * kMicrosecondsPerSecond)) * kNanosecondsPerMicrosecond;
-    ts.tv_sec = secs;
-    ts.tv_nsec = nanos;
+    ts.tv_sec = static_cast<int32_t>(secs);
+    ts.tv_nsec = static_cast<long>(nanos);  // NOLINT (long used in timespec).
     int result = pthread_cond_timedwait_relative_np(data_.cond(),
                                                     data_.mutex(),
                                                     &ts);