Fix MAKE_THROW_FRAME on x86

[Andrew Haley]

Richard Henderson writes:
 > On Sun, Feb 08, 2004 at 11:50:47AM -0500, Diego Novillo wrote:
 > > MAKE_THROW_FRAME was taking the address of an incoming parameter and
 > > dereferencing it.  The aliasing changes I'm working on were correctly
 > > assuming that all the stores through that pointer were dead.
 > 
 > This should *really* be fixed by using the SA_SIGINFO signal
 > frame instead.

Yes, that's true; the x86 code is rether old.  I think all of the
other handlers use SA_SIGINFO, which makes this one a bit of an
anomaly.

Andrew.