PR target/70245
	* rtlanal.c (replace_rtx): For REG, if from is a REG,
	return to even if only REGNO is equal, and assert
	mode is the same.

	* g++.dg/opt/pr70245.C: New test.
	* g++.dg/opt/pr70245.h: New file.
	* g++.dg/opt/pr70245-aux.cc: New file.

Co-Authored-By: Richard Biener <rguenther@suse.de>

From-SVN: r234265