[sanitizer] added a bit vector class to be used in a deadlock detector

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201210 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer] Reduce stack frame size of SlowUnwindStackWithContext

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201212 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer] Build sanitizer_common with -Wframe-larger-than=512 flag

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201213 91177308-0d34-0410-b5e6-96231b3b80d8