tsan: deflake tests

the tests produce episodic flakes
the hypothesis is that it's due to our "racy" race detection algorithm
sleeps should remove the flakes

llvm-svn: 195351

compiler-rt/lib/tsan/lit_tests/tls_race.cc

@@ -1,8 +1,10 @@
 // RUN: %clangxx_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
 #include <pthread.h>
 #include <stddef.h>
+#include <unistd.h>
 
 void *Thread(void *a) {
+  sleep(1);
   *(int*)a = 43;
   return 0;
 }

compiler-rt/lib/tsan/lit_tests/tls_race2.cc

@@ -4,6 +4,7 @@
 #include <unistd.h>
 
 void *Thread2(void *a) {
+  sleep(1);
   *(int*)a = 43;
   return 0;
 }