fix(runtime): clear exec_env_tls on early return from stack overflow check

Move the fix to clear exec_env_tls at the source - in the early return
path of invoke_native_with_hw_bound_check when native stack overflow
check fails.

Changes:
- aot_runtime.c: Clear exec_env_tls before early return on stack overflow
- wasm_runtime.c: Clear exec_env_tls before early return on stack overflow
- Remove defensive fix from wasm_exec_env_destroy (no longer needed)
- Move test from standalone to unit tests (runtime-common)

The bug: When wasm_runtime_call_wasm sets exec_env_tls but returns early
due to native stack overflow check failure, TLS was not cleared. This
caused subsequent calls with a different exec_env to fail with
"invalid exec env" error.

Author: teamchong

core/iwasm/aot/aot_runtime.c

@@ -2485,6 +2485,7 @@ invoke_native_with_hw_bound_check(WASMExecEnv *exec_env, void *func_ptr,
        native stack to run the following codes before actually calling
        the aot function in invokeNative function. */
     if (!wasm_runtime_detect_native_stack_overflow(exec_env)) {
+        wasm_runtime_set_exec_env_tls(NULL);
         return false;
     }
 

core/iwasm/common/wasm_exec_env.c

@@ -199,20 +199,6 @@ wasm_exec_env_create(struct WASMModuleInstanceCommon *module_inst,
 void
 wasm_exec_env_destroy(WASMExecEnv *exec_env)
 {
-#ifdef OS_ENABLE_HW_BOUND_CHECK
-    /*
-     * Clear exec_env_tls if it points to this exec_env to avoid dangling
-     * pointer after destruction. This is critical for daemon-style execution
-     * where the same thread runs multiple WASM modules sequentially.
-     * Without this, the signal handler may access freed memory on subsequent
-     * executions, causing crashes.
-     */
-    WASMExecEnv *current_tls = wasm_runtime_get_exec_env_tls();
-    if (current_tls == exec_env) {
-        wasm_runtime_set_exec_env_tls(NULL);
-    }
-#endif
-
 #if WASM_ENABLE_THREAD_MGR != 0
     /* Wait for all sub-threads */
     WASMCluster *cluster = wasm_exec_env_get_cluster(exec_env);

core/iwasm/interpreter/wasm_runtime.c

@@ -3618,6 +3618,7 @@ call_wasm_with_hw_bound_check(WASMModuleInstance *module_inst,
        native stack to run the following codes before actually calling
        the aot function in invokeNative function. */
     if (!wasm_runtime_detect_native_stack_overflow(exec_env)) {
+        wasm_runtime_set_exec_env_tls(NULL);
         return;
     }