RFA: regrename: preserve highpart & lowpart extraction in find_oldest_value_reg, copyprop_hardreg_forward_1

[David Edelsohn]

Tue Jul 16 23:53:51 2002  J"orn Rennecke <joern.rennecke@superh.com>

	* regrename.c (maybe_mode_change): New function.
	(find_oldest_value_reg, copyprop_hardreg_forward_1): Use it.

This patch fixes the PowerPC bootstrap problems for me as well.  Will
someone with global write privileges please review this patch?

Thanks, David