Add pretty printer for ASAN_MARK and add a helper fn

Add pretty printer for ASAN_MARK and add a helper fn

        * asan.c (asan_mark_poison_p): Remove.
        (asan_mark_p): New function.
        (transform_statements): Use the function.
        (asan_expand_mark_ifn): Do not use masked enum.
        * asan.h (enum asan_mark_flags): Declare it via a macro.
        * gimple-pretty-print.c (dump_gimple_call_args): Dump first
        argument of ASAN_MARK.
        * gimplify.c (build_asan_poison_call_expr): Use new enum values.
        (asan_poison_variable): Likewise.
        * gcc.dg/asan/use-after-scope-goto-1.c: Update first argument of
        scanned pattern ASAN_MARK.
        * gcc.dg/asan/use-after-scope-goto-2.c: Likewise.
        * gcc.dg/asan/use-after-scope-switch-1.c: Likewise.
        * gcc.dg/asan/use-after-scope-switch-2.c: Likewise.
        * gcc.dg/asan/use-after-scope-switch-3.c: Likewise.

Change-Id: Ife3e6037a03ec2b25a15d45bb301f43b750e6649
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@243597138bc75d-0d04-0410-961f-82ee72b054a4