Fix fuzzer support after CALL VM changes (#18491)

Author: nielsdos

sapi/fuzzer/fuzzer-execute-common.h

@@ -27,12 +27,14 @@
 #define FILE_NAME "/tmp/fuzzer.php"
 #define MAX_STEPS 1000
 #define MAX_SIZE (8 * 1024)
+#define ZEND_VM_ENTER_BIT 1ULL
+
 static uint32_t steps_left;
 static bool bailed_out = false;
 
 /* Because the fuzzer is always compiled with clang,
  * we can assume that we don't use global registers / hybrid VM. */
-typedef int (ZEND_FASTCALL *opcode_handler_t)(zend_execute_data *);
+typedef zend_op *(ZEND_FASTCALL *opcode_handler_t)(zend_execute_data *, const zend_op *);
 
 static zend_always_inline void fuzzer_bailout(void) {
 	bailed_out = true;
@@ -51,11 +53,13 @@ static zend_always_inline void fuzzer_step(void) {
 static void (*orig_execute_ex)(zend_execute_data *execute_data);
 
 static void fuzzer_execute_ex(zend_execute_data *execute_data) {
+	const zend_op *opline = EX(opline);
 	while (1) {
-		int ret;
 		fuzzer_step();
-		if ((ret = ((opcode_handler_t) EX(opline)->handler)(execute_data)) != 0) {
-			if (ret > 0) {
+		opline = ((opcode_handler_t) opline->handler)(execute_data, opline);
+		if ((uintptr_t) opline & ZEND_VM_ENTER_BIT) {
+			opline = (const zend_op *) ((uintptr_t) opline & ~ZEND_VM_ENTER_BIT);
+			if (opline) {
 				execute_data = EG(current_execute_data);
 			} else {
 				return;