[LSAN] Disable leak_check_before_thread_started for hwasan

Author: kstoimenov

compiler-rt/test/lsan/TestCases/leak_check_before_thread_started.cpp

@@ -2,6 +2,10 @@
 // This test relies on timing between threads, so any failures will be flaky.
 // RUN: %clangxx_lsan %s -o %t
 // RUN: %env_lsan_opts="log_pointers=1:log_threads=1" %run %t
+
+// Fixme: remove once test passes with hwasan
+// UNSUPPORTED: hwasan
+
 #include <assert.h>
 #include <pthread.h>
 #include <stdio.h>