Fix ZEND_IS op1 literal compaction

Author: iluuu1994

Zend/zend_compile.c

@@ -5968,6 +5968,9 @@ static void zend_compile_match(znode *result, zend_ast *ast)
 
 					zend_op *opline = zend_emit_op_tmp(NULL, ZEND_IS, &expr_node, &pattern_node);
 					SET_NODE(opline->result, &case_node);
+					if (opline->op1_type == IS_CONST) {
+						Z_TRY_ADDREF_P(CT_CONSTANT(opline->op1));
+					}
 				}
 
 				jmpnz_opnums[cond_count] = zend_emit_cond_jump(ZEND_JMPNZ, &case_node, 0);

Zend/zend_opcode.c

@@ -878,7 +878,8 @@ static bool keeps_op1_alive(zend_op *opline) {
 	 || opline->opcode == ZEND_SWITCH_STRING
 	 || opline->opcode == ZEND_MATCH
 	 || opline->opcode == ZEND_FETCH_LIST_R
-	 || opline->opcode == ZEND_COPY_TMP) {
+	 || opline->opcode == ZEND_COPY_TMP
+	 || opline->opcode == ZEND_IS) {
 		return 1;
 	}
 	ZEND_ASSERT(opline->opcode != ZEND_FE_FETCH_R