[sanitizer] revert r200197: the buggy kernel (https://bugzilla.kernel.org/show_bug.cgi?id=67651) is almost unusable with asan even with this workaround (too slow), so this workaround makes no sense. The asan/msan bootstrap bot was changed to use a non-buggy kernel

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@200217 91177308-0d34-0410-b5e6-96231b3b80d8