Add more checks to enhance security (#446)

add more checks to enhance security
clear "wasi proc exit" exception before return to caller in wasm/aot call functions
fix memory profiling issue
change movdqa to movdqu in simd invokeNative asm codes to fix issue of unaligned address access
move setjmp/longjmp from libc-builtin to libc-emcc
fix zephyr platform compilation issue in latest zephyr version

core/iwasm/libraries/thread-mgr/thread_manager.c

@@ -288,6 +288,10 @@ wasm_cluster_spawn_exec_env(WASMExecEnv *exec_env)
     WASMExecEnv *new_exec_env;
     uint32 aux_stack_start, aux_stack_size;
 
+    if (!module) {
+        return NULL;
+    }
+
     if (!(new_module_inst =
         wasm_runtime_instantiate_internal(module, true, 8192,
                                           0, NULL, 0))) {