vim-patch:8.2.4444: beep caused by test

Problem:    Beep caused by test.  ASAN reports leaks.
Solution:   Do not put a NL at the end of the script.  Make the text work on
            MS-Windows.  Do not run the test with ASAN.
68eab67119

The test is skipped, but cherry-pick CheckNotAsan from v8.2.2424 anyway.
97202d9516

src/nvim/testdir/check.vim

@@ -137,6 +137,14 @@ func CheckNotMSWindows()
   endif
 endfunc
 
+" Command to check for not running under ASAN
+command CheckNotAsan call CheckNotAsan()
+func CheckNotAsan()
+  if execute('version') =~# '-fsanitize=[a-z,]*\<address\>'
+    throw 'Skipped: does not work with ASAN'
+  endif
+endfunc
+
 " Command to check for satisfying any of the conditions.
 " e.g. CheckAnyOf Feature:bsd Feature:sun Linux
 command -nargs=+ CheckAnyOf call CheckAnyOf(<f-args>)

src/nvim/testdir/test_exit.vim

@@ -114,13 +114,14 @@ func Test_exit_error_reading_input()
   throw 'Skipped: Nvim does not exit after stdin is read'
 
   CheckNotGui
-  CheckNotMSWindows
+  " The early exit causes memory not to be freed somehow
+  CheckNotAsan
 
-  call writefile([":au VimLeave * call writefile(['l = ' .. v:exiting], 'Xtestout')", ":tabnew\<CR>q:"], 'Xscript')
+  call writefile([":au VimLeave * call writefile(['l = ' .. v:exiting], 'Xtestout')", ":tabnew", "q:"], 'Xscript', 'b')
 
   " Nvim requires "-s -" to read stdin as Normal mode input
-  " if RunVim([], [], '< Xscript')
-  if RunVim([], [], '-s - < Xscript')
+  " if RunVim([], [], '<Xscript')
+  if RunVim([], [], '-s - <Xscript')
     call assert_equal(['l = 1'], readfile('Xtestout'))
   endif
   call delete('Xscript')