vim-patch:8.0.1787: cannot insert the whole cursor line

Problem:    Cannot insert the whole cursor line.
Solution:   Make CTRL-R CTRL-L work. (Andy Massimino, closes vim/vim#2857)
e2c8d83926

src/nvim/ops.c

@@ -1257,6 +1257,14 @@ int get_spec_reg(
     *allocated = TRUE;
     return TRUE;
 
+  case Ctrl_L:                  // Line under cursor
+    if (!errmsg) {
+      return false;
+    }
+
+    *argp = ml_get_buf(curwin->w_buffer, curwin->w_cursor.lnum, false);
+    return true;
+
   case '_':                     /* black hole: always empty */
     *argp = (char_u *)"";
     return TRUE;