[asan] simplify the code that poisons global redzones, add some more tests

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173251 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: add missing interceptors


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173253 91177308-0d34-0410-b5e6-96231b3b80d8