Fix scope_is_known() for class constants

Here the active_op_array is still the surrounding file, but we
do know the scope.

Author: nikic

Zend/tests/bug69676.phpt

@@ -0,0 +1,19 @@
+--TEST--
+Bug #69676: Resolution of self::FOO in class constants not correct
+--FILE--
+<?php
+class A {
+	const myConst = "const in A";
+	const myDynConst = self::myConst;
+}
+
+class B extends A {
+	const myConst = "const in B";
+}
+
+var_dump(B::myDynConst);
+var_dump(A::myDynConst);
+?>
+--EXPECT--
+string(10) "const in A"
+string(10) "const in A"

Zend/zend_compile.c

@@ -1325,14 +1325,10 @@ static inline zend_bool zend_is_scope_known() /* {{{ */
 		return 0;
 	}
 
-	if (!CG(active_op_array)->function_name) {
-		/* A file/eval will be run in the including/eval'ing scope */
-		return 0;
-	}
-
 	if (!CG(active_class_entry)) {
-		/* Not being in a scope is a known scope */
-		return 1;
+		/* The scope is known if we're in a free function (no scope), but not if we're in
+		 * a file/eval (which inherits including/eval'ing scope). */
+		return CG(active_op_array)->function_name != NULL;
 	}
 
 	/* For traits self etc refers to the using class, not the trait itself */