Hi,

This patch is to make move_unallocated_pseudos consistent
to what we have in function find_moveable_pseudos, where we
record the original pseudo into pseudo_replaced_reg only if
validate_change succeeds with newreg.  To ensure every
unallocated pseudo in move_unallocated_pseudos has expected
information, it's better to add a check and skip it if it's
unexpected.  This avoids possible ICEs in future.

btw, I happened to found this in the bootstrapping for one
experimental local patch, which is considered as impractical.

Bootstrapped/regtested on powerpc64le-linux-gnu P9.

BR,
Kewen

gcc/ChangeLog:

	* ira.c (move_unallocated_pseudos): Check other_reg and skip if
	it isn't set.