[Cpp] XPath.findAll does not produce the same result than python3 runtime

[Thomasb81]

Hello

Using 4.13.1 Cpp runtime with xpath feature I found a mismatch with result produce by python3 runtime.

Attached testcase reproduce the python3 testcase testing XPath feature :

antlr4/runtime/Python3/tests/xpathtest.py

Line 14 in b3bb743

class XPathTest(unittest.TestCase):

case_issue4.tar.gz

Execution of provide testcase agains Cpp runtime 4.13.1 produce:

[func, func, ]
[func, func, ]
[func, func, ]
[prog, ]
[prog, ]
[prog, ]
[prog, ]
[f, x, y, x, y, g, x, x, ]
[y, x, ]
[x, y, x, ]
[return, ]
[return, ]
[3, 4, y, 1, 2, x, ]
[stat, stat, stat, stat, ]
[def, def, ]
[;, ;, ;, ;, ]
[3, 4, 1, 2, ]
[expr, expr, expr, expr, expr, expr, ]
[]
[]
[y, x, x, x, ]

Which is conform to expected except for last pattern. The last pattern seems to have been added to covers #370 according comment in python testcase.
The expected result is:

[y, x, ]