Patch for the trap handler and some test list sanity

[Mark Johnston]

On Fri, Jun 21, 2013 at 11:47:43AM -0700, Jeff Ford wrote:
> Anton Rang and I did some DTrace work for Isilon that we're trying to get
> back into FreeBSD, but neither of us is a committer - here's the first one.
> 
> This moves the check for dtrace trap handlers into the low-level exception
> handler to prevent recursive entry when the trap routine is instrumented.
> This fixes several tests which previously panicked including
> cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/safety/tst.basename.d.
> The fix is AMD64 only – neither of us has had time to make changes to i386
> code as we don’t use it here.
> 
> Also this includes updates to the Makefile for the DTrace tests to
> categorize which ones pass, which ones fail, which ones aren’t safe to run
> at all, and which ones sometimes pass and sometimes fail. The list should
> be correct for both AMD64 and i386. This makes “make”, “make ignore”, and
> “make flaky” safe to run in /tools/test/dtrace.

Hello,

I'd be happy to help bring these in. I'll probably need some help
reviewing the first one, but "improve the DTrace test makefile" has been
on my todo list for a while.

Are they available somewhere?

-Mark