Update spec cases to latest version (#1253)

Update spec cases of mvp/threads to latest version, update wabt
to 1.0.29. And enhance the wasm loader.

core/iwasm/interpreter/wasm_loader.c

@@ -2171,6 +2171,15 @@ load_export_section(const uint8 *buf, const uint8 *buf_end, WASMModule *module,
 
         export = module->exports;
         for (i = 0; i < export_count; i++, export ++) {
+#if WASM_ENABLE_THREAD_MGR == 0
+            if (p == p_end) {
+                /* export section with inconsistent count:
+                   n export declared, but less than n given */
+                set_error_buf(error_buf, error_buf_size,
+                              "length out of bounds");
+                return false;
+            }
+#endif
             read_leb_uint32(p, p_end, str_len);
             CHECK_BUF(p, p_end, str_len);
 
@@ -9319,8 +9328,15 @@ re_scan:
     }
 
     if (loader_ctx->csp_num > 0) {
-        set_error_buf(error_buf, error_buf_size,
-                      "function body must end with END opcode");
+        if (cur_func_idx < module->function_count - 1)
+            /* Function with missing end marker (between two functions) */
+            set_error_buf(error_buf, error_buf_size, "END opcode expected");
+        else
+            /* Function with missing end marker
+               (at EOF or end of code sections) */
+            set_error_buf(error_buf, error_buf_size,
+                          "unexpected end of section or function, "
+                          "or section size mismatch");
         goto fail;
     }
 

core/iwasm/interpreter/wasm_runtime.c

@@ -1491,8 +1491,8 @@ wasm_instantiate(WASMModule *module, bool is_sub_inst, uint32 stack_size,
     if (stack_size == 0)
         stack_size = DEFAULT_WASM_STACK_SIZE;
 #if WASM_ENABLE_SPEC_TEST != 0
-    if (stack_size < 48 * 1024)
-        stack_size = 48 * 1024;
+    if (stack_size < 128 * 1024)
+        stack_size = 128 * 1024;
 #endif
     module_inst->default_wasm_stack_size = stack_size;