[asan] Implement max_redzone runtime flag.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@198873 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Temporarily disable two tests that are failing with new glibc.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@198919 91177308-0d34-0410-b5e6-96231b3b80d8
[lsan] rename __lsan_is_turned_off to LeakSanitizerIsTurnedOffForTheCurrentProcess (leave the old variant for now for compatibility)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@198921 91177308-0d34-0410-b5e6-96231b3b80d8