Merge pull request swiftlang#66078 from Michael137/bugfix/lldb-asan-bots-libcxx-testing

[Build] Build libcxx on lldb ASAN/UBSAN bots

Author: Michael137

utils/build-presets.ini

@@ -535,6 +535,8 @@ mixin-preset=buildbot_incremental_base
 
 build-subdir=buildbot_incremental_lldb_asan_ubsan
 
+# Standalone tests require newly built libcxx
+libcxx
 # Build a sanitized lldb. Don't build a sanitized clang/swift.
 lldb
 lldb-extra-cmake-args=-DLLVM_USE_SANITIZER=Address;Undefined