Update compiler-rt for rebase to r212749.

Includes a cherry-pick of:
r213309 - fixes umodsi3

Change-Id: Ic7367e3586b6af7ef74bee6a8cf437d5f28d975a
diff --git a/test/tsan/stack_race2.cc b/test/tsan/stack_race2.cc
index 83a67f4..818db36 100644
--- a/test/tsan/stack_race2.cc
+++ b/test/tsan/stack_race2.cc
@@ -1,4 +1,4 @@
-// RUN: %clangxx_tsan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
 #include <pthread.h>
 #include <stddef.h>
 #include <unistd.h>