lra.c (lra): Clear lra_optional_reload_pseudos before every constraint pass.

2013-09-10  Vladimir Makarov  <vmakarov@redhat.com>

	* lra.c (lra): Clear lra_optional_reload_pseudos before every
	constraint pass.
	* lra-constraints.c (curr_insn_transform): Switch on optional
	reloads.  Check destination too to check move insn.
	(undo_optional_reloads): Add check that the original peudo did not
	changed its allocation and the optional reload was inherited on
	last inheritance pass.  Break loop after deciding to keep optional
	reload.
	(lra_undo_inheritance): Add check that inherited pseudo still in
	memory.

From-SVN: r202468