Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
  Fixed bug #79535

Author: nikic

ext/opcache/Optimizer/zend_optimizer.c

@@ -384,6 +384,7 @@ int zend_optimizer_update_op2_const(zend_op_array *op_array,
 				(opline + 1)->op2.var == opline->result.var) {
 				return 0;
 			}
+			/* break missing intentionally */
 		case ZEND_INSTANCEOF:
 			REQUIRES_STRING(val);
 			drop_leading_backslash(val);

ext/opcache/tests/bug79535.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Bug #79535: PHP crashes with specific opcache.optimization_level
+--INI--
+opcache.optimization_level=0x000000a0
+--FILE--
+<?php
+function create() {
+    $name = stdClass::class;
+    return new $name;
+}
+var_dump(create());
+?>
+--EXPECT--
+object(stdClass)#1 (0) {
+}