[lldb] Skip lldb-server unit tests when building with ASan

The lldb-server unit tests are timing out on GreenDragon and swift-ci.
We haven't been able to reproduce this locally or figure out why. We've
made several attempts to address potential issues, but we've reached a
point where we need to skip them to get signal out of this bot again.

Author: JDevlieghere

lldb/unittests/tools/CMakeLists.txt

@@ -1,3 +1,5 @@
 if(LLDB_TOOL_LLDB_SERVER_BUILD)
-  add_subdirectory(lldb-server)
+  if (NOT LLVM_USE_SANITIZER MATCHES ".*Address.*")
+    add_subdirectory(lldb-server)
+  endif()
 endif()