tsan: intercept _exit so that we can override exit status



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@191898 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: fix false positive in localtime()



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@191899 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: include lsan into presubmit check


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@191902 91177308-0d34-0410-b5e6-96231b3b80d8