[PATCH] disable var-tracking for math/test-tgmath2.c

[Roland McGrath]

> So a massive code change to the test itself has a smaller effect than
> disabling some debug generation settings in the compiler?
> 
> This really makes absolutely no sense to me.

It's not about the immediate effect.  It's about the long-term maintainable
and non-kludgey solution, with the expectation the the details of the
compiler's behavior will change over time.