Test for java-specific output in JSON

In particular, booleans are now printed as true/false instead of 0/1;
NULL as null, and pointer types as their respective structs.

Author: peterschrammel

regression/cbmc-java/json_trace2/Test.class

@@ -0,0 +1,7 @@
+public class Test {
+  boolean test(Object x) {
+    if(x==null)
+      return false;
+    return true;
+  }
+}

regression/cbmc-java/json_trace2/Test.java

@@ -0,0 +1,10 @@
+CORE
+Test.class
+--cover location --trace --json-ui --function Test.test
+activate-multi-line-match
+EXIT=0
+SIGNAL=0
+"outputID": "return",\n *"sourceLocation": \{\n *"file": "Test\.java",\n *"function": "java::Test\.test:\(Ljava/lang/Object;\)Z",\n *"line": "3"\n *\},\n *"stepType": "output",\n *"thread": 0,\n *"values": \[\n *\{\n *"binary": "00000000",\n *"data": "false",\n *"name": "integer",\n *"type": "boolean",\n *"width": 8
+"inputID": "arg1a",\n *"internal": true,\n *"mode": "java",\n *"sourceLocation": \{\n *"file": "Test\.java",\n *"function": "java::Test\.test:\(Ljava/lang/Object;\)Z",\n *"line": "3"\n *\},\n *"stepType": "input",\n *"thread": 0,\n *"values": \[\n *\{\n *"data": "null",\n *"name": "pointer",\n *"type": "struct java\.lang\.Object \{ __CPROVER_string @class_identifier; boolean @lock; \} \*"
+--
+^warning: ignoring