Merge branch 'PHP-7.0' into PHP-7.1

Author: nikic

ext/opcache/tests/jmpz_jmp_elim.phpt

@@ -0,0 +1,16 @@
+--TEST--
+Edge-cases in elimination of JMPZ JMP with same target
+--FILE--
+<?php
+
+$foo = "foo";
+if ($foo . "bar") { goto label; }
+label:
+if ($undef) { goto label2; }
+label2:
+echo "done\n";
+
+?>
+--EXPECTF--
+Notice: Undefined variable: undef in %s on line %d
+done