patch 9.1.0431: eval.c is too long

Problem:  eval.c is too long
Solution: Move garbage collection code to new gc.c file
          (Yegappan Lakshmanan)

closes: #14824

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/list.c b/src/list.c
index e9f1ae3..9479b4b 100644
--- a/src/list.c
+++ b/src/list.c
@@ -3194,4 +3194,28 @@
 	blob_reduce(argvars, &argvars[1], rettv);
 }
 
+/*
+ * slice() function
+ */
+    void
+f_slice(typval_T *argvars, typval_T *rettv)
+{
+    if (in_vim9script()
+	    && ((argvars[0].v_type != VAR_STRING
+		    && argvars[0].v_type != VAR_LIST
+		    && argvars[0].v_type != VAR_BLOB
+		    && check_for_list_arg(argvars, 0) == FAIL)
+		|| check_for_number_arg(argvars, 1) == FAIL
+		|| check_for_opt_number_arg(argvars, 2) == FAIL))
+	return;
+
+    if (check_can_index(&argvars[0], TRUE, FALSE) != OK)
+	return;
+
+    copy_tv(argvars, rettv);
+    eval_index_inner(rettv, TRUE, argvars + 1,
+	    argvars[2].v_type == VAR_UNKNOWN ? NULL : argvars + 2,
+	    TRUE, NULL, 0, FALSE);
+}
+
 #endif // defined(FEAT_EVAL)