Variable names are not recorded in for blocks

[dodie]

If the for block has an increment statement, the state of the variables inside the block are recorded, but not their name.

For example in the following case the name of the variable j is not recorded:

  47|      @Test
  48|      public void for_test() throws Exception {
  49|          for (int i = 0; i < 10; i++) {  // i=0
  50|              int j = i * 2;  // 0
  51|*             fail();  // AssertionError
  52|          }
  53|      }

But with an empty increment statementthe recording works fine:

  47|      @Test
  48|      public void for_test() throws Exception {
  49|          for (int i = 0; i < 10;) {  // i=0
  50|              int j = i * 2;  // j=0
  51|*             fail();  // AssertionError
  52|          }
  53|      }

[dodie]

Turns out, sometimes the end label of a variable is for an earlier line number than the start label.
Fixed scope calculation to handle this case.