Add regression test for multidimentional char array

Author: yumibagge

jbmc/regression/jbmc/multidimensional-array-char/My.class

@@ -0,0 +1,17 @@
+public class My {
+  public int check2DCharArray(char[][] board, boolean assertionCheck) {
+    int diff = 0;
+    for (int row = 0; row < 2; row++) {
+      for (int col = 0; col < 2; col++) {
+        if (board[row][col] == 'O') {
+          diff++;
+          assert !assertionCheck;
+        } else if (board[row][col] == 'X') {
+          diff--;
+          assert !assertionCheck;
+        }
+      }
+    }
+    return 0;
+  }
+}

jbmc/regression/jbmc/multidimensional-array-char/My.java

@@ -0,0 +1,12 @@
+CORE
+My.class
+--function My.check2DCharArray --unwind 5 --max-nondet-array-length 10
+line 8 assertion at file My.java.*: FAILURE
+line 11 assertion at file My.java.*: FAILURE
+^VERIFICATION FAILED$
+^EXIT=10$
+^SIGNAL=0$
+--
+--
+Multidimentional char array used to cause a performance issue (test-gen 0.8.1).
+This was reported in TG-5076. The issue is no longer reproducible 0.9.0+.