Test: Expand verbose mode

(cherry picked from commit 95e132e)

Author: gbaraldi

src/threading.c

@@ -309,6 +309,8 @@ JL_DLLEXPORT uint64_t jl_get_ptls_rng(void) JL_NOTSAFEPOINT
     return jl_current_task->ptls->rngseed;
 }
 
+typedef void (*unw_tls_ensure_func)(void) JL_NOTSAFEPOINT;
+
 // get thread local rng
 JL_DLLEXPORT void jl_set_ptls_rng(uint64_t new_seed) JL_NOTSAFEPOINT
 {
@@ -394,7 +396,10 @@ jl_ptls_t jl_init_threadtls(int16_t tid)
 #if !defined(_OS_WINDOWS_) && !defined(JL_DISABLE_LIBUNWIND) && !defined(LLVMLIBUNWIND)
     // ensures libunwind TLS space for this thread is allocated eagerly
     // to make unwinding async-signal-safe even when using thread local caches.
-    unw_ensure_tls();
+    unw_tls_ensure_func jl_unw_ensure_tls = NULL;
+    jl_dlsym(jl_exe_handle, "unw_ensure_tls", (void**)&jl_unw_ensure_tls, 0);
+    if (jl_unw_ensure_tls)
+        jl_unw_ensure_tls();
 #endif
 
     return ptls;