Add standalone cases (#3536)

tests/standalone/test-running-modes/wasm-apps/mytest.c

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+recursive(int a)
+{
+    if (a > 0) {
+        return recursive(a - 1) + 1;
+    }
+    else
+        return 0;
+}
+
+int
+testFunction(int *input, int length)
+{
+    int sum = 0;
+    for (int i = 0; i < length; ++i) {
+        sum += input[i];
+    }
+    return sum;
+}
+
+int
+main(int argc, char **argv)
+{
+
+    int arr[5] = { 1, 2, 3, 4, 5 };
+    testFunction(arr, recursive(5));
+
+    char *buf;
+
+    printf("Hello world!\n");
+
+    buf = malloc(1024);
+    if (!buf) {
+        printf("malloc buf failed\n");
+        return -1;
+    }
+
+    printf("buf ptr: %p\n", buf);
+
+    snprintf(buf, 1024, "%s", "1234\n");
+    printf("buf: %s", buf);
+
+    free(buf);
+    return 0;
+}