combine.c (simplify_if_then_else): Do not replace (if_then_else (ne reg 0) (0) (const_int)) by (reg) if...

ChangeLog:

	* combine.c (simplify_if_then_else): Do not replace
	(if_then_else (ne reg 0) (0) (const_int)) by (reg) if the
	modes differ.

testsuite/ChangeLog:

	* gcc.dg/20040217-1.c: New test.

From-SVN: r77988