vim-patch:8.1.1682: placing a larger number of ...

...signs is slow

Problem:    Placing a larger number of signs is slow.
Solution:   Add functions for dealing with a list of signs. (Yegappan
            Lakshmanan, closes #4636)

src/nvim/eval.lua

@@ -316,8 +316,10 @@ return {
     sign_getplaced={args={0, 2}},
     sign_jump={args={3, 3}},
     sign_place={args={4, 5}},
+    sign_placelist={args={1}},
     sign_undefine={args={0, 1}},
     sign_unplace={args={1, 2}},
+    sign_unplacelist={args={1}},
     simplify={args=1},
     sin={args=1, func="float_op_wrapper", data="&sin"},
     sinh={args=1, func="float_op_wrapper", data="&sinh"},