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



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195351 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] rename contiguous-container-buffer-overflow (too long) to container-overflow

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195352 91177308-0d34-0410-b5e6-96231b3b80d8