rtl.h (struct rtx_def): Add a comment for member unchanging.

rtl.h (struct rtx_def): Add a comment for member unchanging.

2012-10-28  Vladimir Makarov  <vmakarov@redhat.com>

	* rtl.h (struct rtx_def): Add a comment for member unchanging.
	* lra-int.h (LRA_TEMP_CLOBBER_P): New macro.
	(lra_hard_reg_substitution): Rename to lra_final_code_change.
	* lra-constraints.c (match_reload): Mark temporary clobbers.
	* lra-spill.c (lra_hard_reg_substitution): Rename to
	lra_final_code_change.  Remove temporary clobbers.
	* lra.c (lra): Rename to lra_final_code_change.

From-SVN: r192897