runtime(vim): Update base-syntax, match OR operator in :echo and :execute

Don't match the OR operator in expressions as a trailing bar.

closes: #17533

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/vim_ex_echo.vim

@@ -1,5 +1,6 @@
 " Vim :echo commands
 
+
 echo        "Answer = " 42
 echon       "Answer = " 42
 echomsg     "Answer = " 42
@@ -7,10 +8,25 @@ echowindow  "Answer = " 42
 echoerr     "Answer = " 42
 echoconsole "Answer = " 42
 
-echo "following command is :|" | |
+
+" trailing bar vs OR operator
+
+" OR operator
+echo foo || bar
+echo foo ||
+      \ bar
+
+" following command is :|
+echo "Foo" | |
+
+" invalid expression
+echo "Foo" ||
 
 echohl WarningMsg | echo "Don't panic!" | echohl None
 
+
+" line continuations
+
 echo "Answer = "
      "\ comment
       \ 42
@@ -20,11 +36,14 @@ echo
      "\ comment
       \ 42
 
+
+" trailing bar and comments
+
 " :echo without {expr}
 echo| echo "Foo"
 
 " trailing comment needs |
-echo "foo" | " comment
+echo "Foo" | " comment
 
 
 " Issue #9987 (parenthesised argument - not a function call)
@@ -36,3 +55,4 @@ if 123
 else
 	echo 'bar'
 endif
+