Fix calls to pthread_join

BUG=
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Review URL: https://codereview.chromium.org/1412343002 .

Author: zanderso

runtime/vm/os_thread_android.cc

@@ -167,7 +167,8 @@ ThreadJoinId OSThread::GetCurrentThreadJoinId() {
 
 
 void OSThread::Join(ThreadJoinId id) {
-  ASSERT(pthread_join(id, NULL) == 0);
+  int result = pthread_join(id, NULL);
+  ASSERT(result == 0);
 }
 
 

runtime/vm/os_thread_linux.cc

@@ -169,7 +169,8 @@ ThreadJoinId OSThread::GetCurrentThreadJoinId() {
 
 
 void OSThread::Join(ThreadJoinId id) {
-  ASSERT(pthread_join(id, NULL) == 0);
+  int result = pthread_join(id, NULL);
+  ASSERT(result == 0);
 }
 
 

runtime/vm/os_thread_macos.cc

@@ -161,7 +161,8 @@ ThreadJoinId OSThread::GetCurrentThreadJoinId() {
 
 
 void OSThread::Join(ThreadJoinId id) {
-  ASSERT(pthread_join(id, NULL) == 0);
+  int result = pthread_join(id, NULL);
+  ASSERT(result == 0);
 }