Reflect changes in UPGRADING

Author: dstogov

UPGRADING

@@ -125,6 +125,11 @@ PHP 8.0 UPGRADE NOTES
     warning.
   . Uncaught exceptions now go through "clean shutdown", which means that
     destructors will be called after an uncaught exception.
+  . Compile time fatal error "Only variables can be passed by reference" has been
+    delayed until run-time and converted to "Cannot pass parameter by reference"
+    exception.
+  . Some "Only variables should be passed by reference" notices have been converted
+    to "Cannot pass parameter by reference" exception.
 
 - COM:
   . Removed the ability to import case-insensitive constants from type

UPGRADING.INTERNALS

@@ -11,6 +11,8 @@ PHP 8.0 INTERNALS UPGRADE NOTES
   h. zend_value_error()
   i. get_closure() object handler
   j. compare_objects() and compare() object handlers
+  k. The 'I' length modifier
+  l. Some VM instructions switched to IS_TMP_VAR result insted of IS_VAR
 
 2. Build system changes
   a. Abstract
@@ -89,6 +91,13 @@ PHP 8.0 INTERNALS UPGRADE NOTES
      The 'v' format from the custom snprintf and spprintf implementations has
      been removed. Use the standard 's' format instead.
 
+  l. Some VM instructions switched to IS_TMP_VAR result insted of IS_VAR.
+     Actually, all assignments (ZEND_ASSIGN, ZEND_ASSIGN_DIM, ZEND_ASSIGN_OBJ,
+     ZEND_ASSIGN_STATIC_PROP), all compound assignments (ZEND_ASSIGN_OP,
+     ZEND_ASSIGN_DIM_OP, ZEND_ASSIGN_OBJ_OP, ZEND_ASSIGN_STATIC_PROP_OP) and all
+     pre increments/decremets (ZEND_PRE_INC, ZEND_PRE_DEC, ZEND_PRE_INC_OBJ
+     ZEND_PRE_DEC_OBJ, ZEND_PRE_INC_STATIC_PROP ZEND_PRE_DEC_STATIC_PROP).
+
 ========================
 2. Build system changes
 ========================