Strip timestamp more carefully in kasan symbolizer

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1891 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Fix getting line numbers in kasan symbolizer

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1892 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5