another case of Arithmetic exception on amd64

[Mikhail T.]

Hello!

I built and installed audio/timidity the stock compiler with my usual
CFLAGS:

	-O2 -fno-strict-aliasing -pipe -march=opteron

It dies on startup from SIGFPE. I turned on "-Wall -Werror" and patched
the port to compile cleanly without any warning. That did not help...

Compiling with -O1 or -O0 is fine. I remember having the same issue
with Tcl84 compiled with -O2 -- what's wrong with the second level of
optimization? Is not it supposed to finally work?

I'm using 5.4-stable from July 21 on amd64. Please, advise. Thanks!

	-mi