Restore opcache_invalidate() fuzzer behavior

The zend_exception_save() and zend_exception_restore() functions were removed in
GH-20256. However, the fuzzer expects to be able to call opcache_invalidate()
even if there was an exception thrown. I'm not sure why exactly, but let's
restore the previous behavior.

Closes OSS-Fuzz #476466130

Author: iluuu1994

sapi/fuzzer/fuzzer-execute-common.h

@@ -134,6 +134,8 @@ ZEND_ATTRIBUTE_UNUSED static void create_file(void) {
 
 ZEND_ATTRIBUTE_UNUSED static void opcache_invalidate(void) {
 	steps_left = MAX_STEPS;
+	zend_object *exception = EG(exception);
+	EG(exception) = NULL;
 	zval retval, args[2];
 	zend_function *fn = zend_hash_str_find_ptr(CG(function_table), ZEND_STRL("opcache_invalidate"));
 	ZEND_ASSERT(fn != NULL);
@@ -144,4 +146,5 @@ ZEND_ATTRIBUTE_UNUSED static void opcache_invalidate(void) {
 	ZEND_ASSERT(Z_TYPE(retval) == IS_TRUE);
 	zval_ptr_dtor(&args[0]);
 	zval_ptr_dtor(&retval);
+	EG(exception) = exception;
 }