[lsan] When necessary, define LSan suppression for pthread_exit.

[alekseyshl]

Summary

Generalize already defined LSan suppression for the leak on
pthread_exit, some envs do not have the entire call stack symbolized,
so we have to be less specific.

compiler-rt/trunk/lib/lsan/lsan_common.cc

#define LOG_THREADS(...)                           \
   } while (0);
 
 ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
 static SuppressionContext *suppression_ctx = nullptr;
 static const char kSuppressionLeak[] = "leak";
 static const char *kSuppressionTypes[] = { kSuppressionLeak };
 static const char kStdSuppressions[] =
 #if SANITIZER_SUPPRESS_LEAK_ON_PTHREAD_EXIT
-  // The actual string allocation happens here (for more details refer to the
-  // SANITIZER_SUPPRESS_LEAK_ON_PTHREAD_EXIT definition).
-  "leak:*_dl_map_object_deps*\n"
+  // For more details refer to the SANITIZER_SUPPRESS_LEAK_ON_PTHREAD_EXIT
+  // definition.
+  "leak:*pthread_exit*\n"
 #endif  // SANITIZER_SUPPRESS_LEAK_ON_PTHREAD_EXIT
   // TLS leak in some glibc versions, described in
   // https://sourceware.org/bugzilla/show_bug.cgi?id=12650.
   "leak:*tls_get_addr_tail*\n";
 
 void InitializeSuppressions() {
   CHECK_EQ(nullptr, suppression_ctx);
   suppression_ctx = new (suppression_placeholder) // NOLINT