[sanitizer] implement node removal in Deadlock graph

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201509 91177308-0d34-0410-b5e6-96231b3b80d8
Update license.txt to point to the new code in third_party/android.

Also remove a reference to mach_override code that is long gone.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201510 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] Add a test for stack unwinding in new and delete.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201511 91177308-0d34-0410-b5e6-96231b3b80d8