Revert "[lldb][lit] Add MallocNanoZone envvar to Darwin ASan builds" (llvm#88436)

Reverts llvm#88431. A config variable for the host OS is
unrecognized on the Linux builds and is causing a build failure.

Author: chelcassanova

lldb/test/API/lit.cfg.py

@@ -121,7 +121,6 @@ def delete_module_cache(path):
             config.environment["DYLD_INSERT_LIBRARIES"] = find_sanitizer_runtime(
                 "libclang_rt.asan_osx_dynamic.dylib"
             )
-            config.environment["MallocNanoZone"] = "0"
 
     if "Thread" in config.llvm_use_sanitizer:
         config.environment["TSAN_OPTIONS"] = "halt_on_error=1"

lldb/test/Shell/lit.cfg.py

@@ -52,8 +52,6 @@
 # Enable sanitizer runtime flags.
 config.environment["ASAN_OPTIONS"] = "detect_stack_use_after_return=1"
 config.environment["TSAN_OPTIONS"] = "halt_on_error=1"
-if "Darwin" in config.host_os:
-    config.environment["MallocNanoZone"] = "0"
 
 # 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