[lldb][lit] Guard MallocNanoZone envvar in shell tests (#88824)

Previously the MallocNanoZone envvar would be set to 0 on Darwin for the
LLDB shell tests, but this should guarded behind ASan being enabled as
opposed to simply running the test suite behind Darwin. This required
that the LLVM_USE_SANITIZER option be added as an attribute to the lit
config for shell tests.

Author: chelcassanova

lldb/test/Shell/lit.cfg.py

@@ -50,10 +50,14 @@
 )
 
 # Enable sanitizer runtime flags.
-config.environment["ASAN_OPTIONS"] = "detect_stack_use_after_return=1"
-config.environment["TSAN_OPTIONS"] = "halt_on_error=1"
-if platform.system() == "Darwin":
-    config.environment["MallocNanoZone"] = "0"
+if "Address" in config.llvm_use_sanitizer:
+    config.environment["ASAN_OPTIONS"] = "detect_stack_use_after_return=1"
+    if platform.system() == "Darwin":
+        config.environment["MallocNanoZone"] = "0"
+
+if "Thread" in config.llvm_use_sanitizer:
+    config.environment["TSAN_OPTIONS"] = "halt_on_error=1"
+
 
 # Support running the test suite under the lldb-repro wrapper. This makes it
 # possible to capture a test suite run and then rerun all the test from the

lldb/test/Shell/lit.site.cfg.py.in

@@ -26,6 +26,7 @@ config.lldb_enable_lua = @LLDB_ENABLE_LUA@
 config.lldb_build_directory = "@LLDB_TEST_BUILD_DIRECTORY@"
 config.have_lldb_server = @LLDB_TOOL_LLDB_SERVER_BUILD@
 config.lldb_system_debugserver = @LLDB_USE_SYSTEM_DEBUGSERVER@
+config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
 # The shell tests use their own module caches.
 config.lldb_module_cache = os.path.join("@LLDB_TEST_MODULE_CACHE_LLDB@", "lldb-shell")
 config.clang_module_cache = os.path.join("@LLDB_TEST_MODULE_CACHE_CLANG@", "lldb-shell")