Patch to combine's handling of shifted sign-extensions

[Richard Henderson]

On Thu, Jun 20, 2002 at 12:46:27PM +0100, Richard Sandiford wrote:
> 	* combine.c (make_extraction): Reapply to the argument of an ASHIFT.
> 	* gcc.dg/20020620-1.c: New test.

Ok.


r~