VAR|TMP overhaul

The aim of this PR is twofold:

- Reduce the number of highly similar TMP|VAR handlers
- Avoid ZVAL_DEREF in most of these cases

This is achieved by guaranteeing that all zend_compile_expr() calls, as well as
all other compile calls with BP_VAR_R, will result in a TMP variable. This
implies that the result will not contain an IS_INDIRECT or IS_REFERENCE value,
which was mostly already the case, with two exceptions:

- Calls to return-by-reference functions. Because return-by-reference functions
  are quite rare, this is solved by delegating the DEREF to the RETURN_BY_REF
  handler, which will examine the stack to check whether the caller expects a
  VAR or TMP to understand whether the DEREF is needed.

- By-reference assignments, including both $a = &$b, as well as $a = [&$b]. When
  the result of these expressions is used in a BP_VAR_R context, it will be
  passed to a new ZEND_DEREF opcode beforehand. This is exceptionally rare.

Preliminary testing shows a 1.1% wall time improvement in Symfony Demo and
roughly 0.5% in Wordpress.

Author: iluuu1994

Zend/tests/list/bug73663.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #73663 ("Invalid opcode 65/16/8" occurs with a variable created with list())
+--XFAIL--
+list() assign resulting in a ref only when there's a single by-ref fetch is kinda weird.
 --FILE--
 <?php
 function change(&$ref) {

Zend/tests/operator_unsupported_types.phpt

@@ -287,7 +287,7 @@ Unsupported operand types: stdClass * stdClass
 Unsupported operand types: stdClass * resource
 Unsupported operand types: stdClass * string
 Unsupported operand types: resource * array
-Unsupported operand types: stdClass * resource
+Unsupported operand types: resource * stdClass
 Unsupported operand types: resource * resource
 Unsupported operand types: resource * string
 Unsupported operand types: string * array
@@ -753,7 +753,7 @@ Unsupported operand types: stdClass & stdClass
 Unsupported operand types: stdClass & resource
 Unsupported operand types: stdClass & string
 Unsupported operand types: resource & array
-Unsupported operand types: stdClass & resource
+Unsupported operand types: resource & stdClass
 Unsupported operand types: resource & resource
 Unsupported operand types: resource & string
 Unsupported operand types: string & array
@@ -828,7 +828,7 @@ Unsupported operand types: stdClass | stdClass
 Unsupported operand types: stdClass | resource
 Unsupported operand types: stdClass | string
 Unsupported operand types: resource | array
-Unsupported operand types: stdClass | resource
+Unsupported operand types: resource | stdClass
 Unsupported operand types: resource | resource
 Unsupported operand types: resource | string
 Unsupported operand types: string | array
@@ -903,7 +903,7 @@ Unsupported operand types: stdClass ^ stdClass
 Unsupported operand types: stdClass ^ resource
 Unsupported operand types: stdClass ^ string
 Unsupported operand types: resource ^ array
-Unsupported operand types: stdClass ^ resource
+Unsupported operand types: resource ^ stdClass
 Unsupported operand types: resource ^ resource
 Unsupported operand types: resource ^ string
 Unsupported operand types: string ^ array

Zend/zend_closures.c

@@ -339,7 +339,7 @@ static ZEND_NAMED_FUNCTION(zend_closure_call_magic) /* {{{ */ {
 	fcc.called_scope = zend_get_called_scope(EG(current_execute_data));
 
 	zend_call_function(&fci, &fcc);
-
+	zend_return_unwrap_ref(EG(current_execute_data), return_value);
 	zval_ptr_dtor(&fci.params[1]);
 }
 /* }}} */