Merge branch 'PHP-8.1'

* PHP-8.1:
  Fix type inference

Author: dstogov

Zend/Optimizer/zend_inference.c

@@ -2703,9 +2703,6 @@ static zend_always_inline zend_result _zend_update_type_info(
 						tmp |= MAY_BE_NULL|MAY_BE_FALSE|MAY_BE_TRUE|MAY_BE_LONG|MAY_BE_DOUBLE|MAY_BE_STRING;
 					}
 				}
-				if (t1 & MAY_BE_OBJECT) {
-					tmp |= MAY_BE_REF;
-				}
 				tmp |= MAY_BE_RC1 | MAY_BE_RCN;
 				UPDATE_SSA_TYPE(tmp, ssa_op->result_def);
 			}

ext/opcache/tests/jit/assign_dim_008.phpt

@@ -0,0 +1,18 @@
+--TEST--
+JIT ASSIGN_DIM: 008
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+opcache.jit_buffer_size=1M
+--FILE--
+<?php
+function(int $a) {
+  $arr = $a[] = (y);
+  $arr = y;
+  $c = $y = $arr[] = y($c);
+}
+?>
+DONE
+--EXPECT--
+DONE