patch 9.1.0827: CI: tests can be improved

Problem:  CI: tests can be improved
Solution: collect failed indent tests, raise timeout for search()
          functions when using ASAN/Valgrind (Aliaksei Budavei)

ASan-instrumented Vim builds tend to run slower (x2) than
non-instrumented Vim builds and occasionally make indent
tests fail when "search*()" functions time out and give up
further execution.

Reference:
https://github.com/google/sanitizers/wiki/AddressSanitizer

closes: #15974

Co-authored-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/shared.vim

@@ -318,6 +318,14 @@ func RunningWithValgrind()
   return GetVimCommand() =~ '\<valgrind\>'
 endfunc
 
+func RunningAsan()
+  return exists("$ASAN_OPTIONS")
+endfunc
+
+func ValgrindOrAsan()
+  return RunningWithValgrind() || RunningAsan()
+endfun
+
 " Get the command to run Vim, with --clean instead of "-u NONE".
 func GetVimCommandClean()
   let cmd = GetVimCommand()