Update type inference for ZEND_GET_CLASS and ZEND_GET_CALLED_CLASS

These cannot return false anymore since PHP 8.0.

Author: nielsdos

Zend/Optimizer/zend_inference.c

@@ -3584,7 +3584,7 @@ static zend_always_inline zend_result _zend_update_type_info(
 			break;
 		case ZEND_GET_CLASS:
 		case ZEND_GET_CALLED_CLASS:
-			UPDATE_SSA_TYPE(MAY_BE_FALSE|MAY_BE_STRING|MAY_BE_RCN, ssa_op->result_def);
+			UPDATE_SSA_TYPE(MAY_BE_STRING|MAY_BE_RCN, ssa_op->result_def);
 			break;
 		case ZEND_GET_TYPE:
 			UPDATE_SSA_TYPE(MAY_BE_STRING|MAY_BE_RC1|MAY_BE_RCN, ssa_op->result_def);