rfa (x86): 387<=>sse moves

[Paolo Bonzini]

Dale Johannesen wrote:
> With -march=pentium4 -mfpmath=sse -O2, we get an extra move for code like
> 
>     double d = atof(foo);
>     int i = d;
> 
>         call    atof
>         fstpl   -8(%ebp)
>         movsd   -8(%ebp), %xmm0
>         cvttsd2si       %xmm0, %eax
> 
> (This is Linux, Darwin is similar.)  I think the difficulty is that for

Try the attached patch.  It gave a 3% speedup on -mfpmath=sse for 
tramp3d.  Richard Henderson asked for SPEC testing, then it may go in.

Paolo
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