[ASan tests] Auto-define ASAN_NEEDS_SEGV rather than hardcode it in cmake

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208322 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan tests] More progress towards Windows support

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208323 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan tests] More progress towards Windows support

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208325 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan tests] More progress towards Windows support

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@208326 91177308-0d34-0410-b5e6-96231b3b80d8