VLA fix [1/3]: added testcase demonstrating VLA bug

tests/tcctest.c

@@ -2079,9 +2079,14 @@ void *bounds_checking_is_enabled()
 }
 
 void c99_vla_test(int size1, int size2)
-{
+{
+#if defined __i386__ || defined __x86_64__
     int size = size1 * size2;
     int tab1[size][2], tab2[10][2];
+    void *tab1_ptr, *tab2_ptr, *bad_ptr;
+
+    /* "size" should have been 'captured' at tab1 declaration, 
+        so modifying it should have no effect on VLA behaviour. */
     size = size-1;
     
     printf("Test C99 VLA 1 (sizeof): ");