N°2651 rollback gitignore for lib tests dirs

Too dangerous ! We'll work properly on this but for 2.8

lib/nikic/php-parser/test/code/parser/stmt/loop/while.test

@@ -0,0 +1,25 @@
+While loop
+-----
+<?php
+
+while ($a) {}
+
+while ($a):
+endwhile;
+-----
+array(
+    0: Stmt_While(
+        cond: Expr_Variable(
+            name: a
+        )
+        stmts: array(
+        )
+    )
+    1: Stmt_While(
+        cond: Expr_Variable(
+            name: a
+        )
+        stmts: array(
+        )
+    )
+)