[intermediate representation] fixed some bugs

examples/matrix.cpp

@@ -15,11 +15,14 @@ const char src[] =
 "\
 void test(fp32 *A, fp32 *B, fp32 *C, int32 i){\
   int32 j = 1;\
-  int32 test[16, 16] = 0;\
-  int32 test2[16, 16];\
-  int32 test3[16, 16];\
   int32 k;\
-  test = test2 + test3;\
+  i = i + j;\
+  for(k = 0; k < 10; k = k+1){\
+    int32 u = 1;\
+    u = u + i;\
+    if(k == 0)\
+     u = u + 2;\
+  }\
 }\
 ";