[region] update tests

src/plugins/region/tests/region/oracle/blob.res.oracle

 [kernel] Parsing blob.i (no preprocessing)
 [region] Analyzing regions
 [region] Function array_blob:
-  R0003: --- arr 32b ;
+  R0003: --- arr[3] 32b ;
   R0001: -W- p (int *) 64b (*R0003) ;
 [region] Function struct_blob:
   R0003: --- y 64b { .f: R0004[…]; #32b; } ;
   R0004: --- 0b ;
   R0001: -W- p (int *) 64b (*R0004) ;
 [region] Function var_blob:
-  R0003: --- x 0b ;
+  R0003: --- x[…] 0b ;
   R0001: -W- p (int *) 64b (*R0003) ;