patch 9.0.0104: going beyond allocated memory when evaluating string constant

Problem:    Going beyond allocated memory when evaluating string constant.
Solution:   Properly skip over <Key> form.
diff --git a/src/testdir/test_eval_stuff.vim b/src/testdir/test_eval_stuff.vim
index 3c168f2..c63082e 100644
--- a/src/testdir/test_eval_stuff.vim
+++ b/src/testdir/test_eval_stuff.vim
Binary files differ