SCCP: Fix handling of ASSIGN_OBJ_REF

The generic BOT handling is not away of OP_DATA, so need to handle
this opcode before we get to that.

Author: nikic

ext/opcache/Optimizer/sccp.c

@@ -1440,6 +1440,17 @@ static void sccp_visit_instr(scdf_ctx *scdf, zend_op *opline, zend_ssa_op *ssa_o
 				SET_RESULT_BOT(result);
 			}
 			return;
+		case ZEND_ASSIGN_STATIC_PROP_REF:
+		case ZEND_ASSIGN_OBJ_REF:
+			/* Handled here because we also need to BOT the OP_DATA operand, while the generic
+			 * code below will not do so. */
+			SET_RESULT_BOT(result);
+			SET_RESULT_BOT(op1);
+			SET_RESULT_BOT(op2);
+			opline++;
+			ssa_op++;
+			SET_RESULT_BOT(op1);
+			break;
 	}
 
 	if ((op1 && IS_BOT(op1)) || (op2 && IS_BOT(op2))) {
@@ -1915,16 +1926,6 @@ static void sccp_visit_instr(scdf_ctx *scdf, zend_op *opline, zend_ssa_op *ssa_o
 			SET_RESULT_BOT(result);
 			break;
 		}
-		case ZEND_ASSIGN_STATIC_PROP_REF:
-		case ZEND_ASSIGN_OBJ_REF:
-			SET_RESULT_BOT(result);
-			SET_RESULT_BOT(op1);
-			SET_RESULT_BOT(op2);
-			opline++;
-			ssa_op++;
-			op1 = get_op1_value(ctx, opline, ssa_op);
-			SET_RESULT_BOT(op1);
-			break;
 		default:
 		{
 			/* If we have no explicit implementation return BOT */

ext/opcache/tests/opt/sccp_029.phpt

@@ -0,0 +1,27 @@
+--TEST--
+SCCP 029: Don't propagate assignments to references to typed properties
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.optimization_level=-1
+opcache.preload=
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+<?php
+
+class Test { 
+    public string $x = "x";
+}
+function test() {
+    $test = new Test();
+    $ref = "y";
+    $test->x =& $ref;
+    $ref = 42;
+    var_dump($ref);
+}
+test();
+
+?>
+--EXPECT--
+string(2) "42"