[sanitizer] more code for deadlock detector, nothing really works yet (except for small unit tests).

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201302 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] AArch64 sanitizer support; patch by Christophe Lyon and Yvan Roux

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201303 91177308-0d34-0410-b5e6-96231b3b80d8