Unify 64bit int constant definitions.

LL and ULL prefixes are word size dependent, use the INT64_C and UINT64_C
macros instead.

Change-Id: I5b70027651898814fc0b3e9e22a18a1047e76cb9
diff --git a/runtime/thread.cc b/runtime/thread.cc
index 680d269..fbdf95f 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -518,7 +518,7 @@
   pthread_getcpuclockid(pthread_self_, &cpu_clock_id);
   timespec now;
   clock_gettime(cpu_clock_id, &now);
-  return static_cast<uint64_t>(now.tv_sec) * 1000000LL + now.tv_nsec / 1000LL;
+  return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000);
 #else
   UNIMPLEMENTED(WARNING);
   return -1;