Fix pasto in cse.c

[Eric Botcazou]

It was introduced by the fwprop merge and results in missed optimizations, for 
example with the attached testcase which fails on mainline and 4.3 branch but 
passes on the 4.2 branch.

Tested on i586-suse-linux, applied on the mainline and 4.3 branch.


2008-12-04  Eric Botcazou  <ebotcazou@adacore.com>

	* cse.c (equiv_constant): Fix pasto.


2008-12-04  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc.dg/union-4.c: New test.


-- 
Eric Botcazou
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