[sanitizer] Increase stack size ulimit

Fixes stack overflow in clang/test/SemaTemplate/instantiation-depth-default.cpp
after llvm/llvm-project#65742

Author: vitalybuka

zorg/buildbot/builders/sanitizers/buildbot_functions.sh

@@ -41,6 +41,7 @@ echo @@@BUILD_STEP Info@@@
   uptime
   echo
   ulimit -n 1000000
+  ulimit -s 12288
   ulimit -a
   echo
   df -h