Mainline broken on alpha and x86-64. SPEC2000's eon does notbuild.

[Paolo Bonzini]

I've got a lot of failures everywhere but in C, and it seems unlikely 
that the cause is the floating-point comparison patch I've been 
discussing with Roger.  I'm trying to apply that patch to a 2-days old 
tree and seeing what happens (though I'm leaving the office soon and 
will be able to look at the results only tomorrow morning).

Paolo