[asan] Improve stack overflow detection.

There are more cases when those manifest as an access below SP.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201664 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Introduce COMPILER_RT_INCLUDE_TESTS option

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201666 91177308-0d34-0410-b5e6-96231b3b80d8