Set thread information earlier in exec_env creation

For boundary checking, WAMR calls `pthread_attr_np`, which is
unfortunately quite slow on Linux when not called on the main thread
(see #3966
for discussion).

This change moves the cost of stack bounds checking earlier in the
wasm_exec_env creation process. The idea is that it's perhaps better to
pay the price when creating the execution environment rather than in the
first function call.

The original code is left in place inside
`call_wasm_with_hw_bound_check` in case the `wasm_exec_env` is created
via `wasm_runtime_spawn_exec_env`.

core/iwasm/common/wasm_exec_env.c

@@ -60,6 +60,14 @@ wasm_exec_env_create_internal(struct WASMModuleInstanceCommon *module_inst,
 #endif
 
 #ifdef OS_ENABLE_HW_BOUND_CHECK
+    if (!os_thread_signal_inited()) {
+        goto fail5;
+    }
+
+    /* Set thread handle and stack boundary if they haven't been set */
+    wasm_exec_env_set_thread_info(exec_env);
+    wasm_runtime_set_exec_env_tls(exec_env);
+
     if (!(exec_env->exce_check_guard_page =
               os_mmap(NULL, os_getpagesize(), MMAP_PROT_NONE, MMAP_MAP_NONE,
                       os_get_invalid_handle())))