[sanitizer] print more stack traces when reporting a deadlock (even more to come)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204034 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] fix build warnings; add an output test for the deadlock detecor

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204035 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] one more output test for the deadlock detector

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@204036 91177308-0d34-0410-b5e6-96231b3b80d8