[fixed-point] Fix after merging from mainline

[Fu, Chao-Ying]

Hi,

  Here is the patch to fix some issues after merging from the 
mainline today.  Thanks!

Regards,
Chao-ying

2006-12-11  Chao-ying Fu  <fu@mips.com>

	* fwprop.c: Add this file, because it was deleted somehow.
	* tree.h (TYPE_SATURATING): Change from ->common to ->base.
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