Error with shorts in Java frontend on SSA

[mgudemann]

The following program:

public class short2
{
  short a;
  void f()
  {
    a++;
  }
}

fails with

converting SSA
+
  * type: signedbv
      * width: 16
  0: byte_extract_little_endian
      * type: signedbv
          * width: 16
      0: symbol
          * type: empty
          * identifier: tmp_object_factory$1!0#1
          * expression: symbol
              * type: empty
              * identifier: tmp_object_factory$1
          * L0: 0
          * L2: 1
          * #SSA_symbol: 1
      1: constant
          * type: signedbv
              * width: 64
              * #c_type: signed_long_int
          * value: 0000000000000000000000000000000000000000000000000000000000000100
  1: constant
      * type: signedbv
          * width: 32
          * #c_type: signed_int
      * value: 00000000000000000000000000000001
add/sub with mixed types

when using cbmc --cover location --function short2.f short2.class