Fold dirname in sccp for non-windows platforms

Author: nikic

ext/opcache/Optimizer/sccp.c

@@ -797,6 +797,10 @@ static zend_bool can_ct_eval_func_call(zend_string *name, uint32_t num_args, zva
 		|| zend_string_equals_literal(name, "array_values")
 		|| zend_string_equals_literal(name, "base64_decode")
 		|| zend_string_equals_literal(name, "base64_encode")
+#ifndef ZEND_WIN32
+		/* On Windows this function may be code page dependent. */
+		|| zend_string_equals_literal(name, "dirname")
+#endif
 		|| zend_string_equals_literal(name, "imagetypes")
 		|| zend_string_equals_literal(name, "in_array")
 		|| zend_string_equals_literal(name, "ltrim")