Remove zend_make_printable_zval() use in debug code

This is an awkward API left from the PHP 5 times. Replacing it
with zval_get_string().

Zend/Optimizer/compact_literals.c

@@ -319,19 +319,14 @@ void zend_optimizer_compact_literals(zend_op_array *op_array, zend_optimizer_ctx
 
 #if DEBUG_COMPACT_LITERALS
 		{
-			int i, use_copy;
 			fprintf(stderr, "File %s func %s\n", op_array->filename->val,
 					op_array->function_name ? op_array->function_name->val : "main");
 			fprintf(stderr, "Literals table size %d\n", op_array->last_literal);
 
-			for (i = 0; i < op_array->last_literal; i++) {
-				zval zv;
-				ZVAL_COPY_VALUE(&zv, op_array->literals + i);
-				use_copy = zend_make_printable_zval(op_array->literals + i, &zv);
-				fprintf(stderr, "Literal %d, val (%zu):%s\n", i, Z_STRLEN(zv), Z_STRVAL(zv));
-				if (use_copy) {
-					zval_ptr_dtor_nogc(&zv);
-				}
+			for (int i = 0; i < op_array->last_literal; i++) {
+				zend_string *str = zval_get_string(op_array->literals + i);
+				fprintf(stderr, "Literal %d, val (%zu):%s\n", i, ZSTR_LEN(str), ZSTR_VAL(str));
+				zend_string_release(str);
 			}
 			fflush(stderr);
 		}
@@ -845,17 +840,12 @@ void zend_optimizer_compact_literals(zend_op_array *op_array, zend_optimizer_ctx
 
 #if DEBUG_COMPACT_LITERALS
 		{
-			int i, use_copy;
 			fprintf(stderr, "Optimized literals table size %d\n", op_array->last_literal);
 
-			for (i = 0; i < op_array->last_literal; i++) {
-				zval zv;
-				ZVAL_COPY_VALUE(&zv, op_array->literals + i);
-				use_copy = zend_make_printable_zval(op_array->literals + i, &zv);
-				fprintf(stderr, "Literal %d, val (%zu):%s\n", i, Z_STRLEN(zv), Z_STRVAL(zv));
-				if (use_copy) {
-					zval_ptr_dtor_nogc(&zv);
-				}
+			for (int i = 0; i < op_array->last_literal; i++) {
+				zend_string *str = zval_get_string(op_array->literals + i);
+				fprintf(stderr, "Literal %d, val (%zu):%s\n", i, ZSTR_LEN(str), ZSTR_VAL(str));
+				zend_string_release(str);
 			}
 			fflush(stderr);
 		}