double-float-bits for x86/sse2. This gives x86 the same
micro-optimizations that were available for sparc and ppc.


 o code/kernel.lisp:
   o Enable fast double-float-bits using the vop instead of calling
     double-float-high-bits/double-float-low-bits. 

 o compiler/float-tran.lisp:
   o Make fast-unary-ftruncate known to compiler and enable optimizer
     for it. 
   o Make double-float-bits known to compiler

 o compiler/x86/float-sse2.lisp:
   o Implement fast-unary-ftruncate for singles and doubles.
   o Implement double-float-bits.

entries with just the file path, removing the revision number, date,
author and state.  The actual information is now computed during
compilation and stored in the fasl itself.  (See ticket:48.)

boot-2010-02-1 as the bootstrap file.  You should probably also use
the new -P option for build.sh to generate and update the po files
while building.

The merge is from the tag "double-double-irrat-end".  The
double-double branch is now obsolete.

The code should build without double-double support (tested on sparc)
as well as build with double-double support (tested also on sparc).

micro-optimization.

(needed by the byte interpreter).

Fixes the following bug:

   (defun foo (x) (1+ (numerator x)))

   (let ((c::*byte-compile* t)) (compile 'foo))

   (foo 2/3) => undefined function KERNEL:%NUMERATOR

of a double-float in multiple-values.  This is better than calling
double-float-high/low-bits which causes 2 stores to the stack to be
done.