RFC: LRA for x86/x86-64 [7/9]

[Vladimir Makarov]

This is the major patch containing all new files.  The patch also adds 
necessary calls to LRA from IRA.As the patch is too big, it continues in 
the next email.

2012-09-27  Vladimir Makarov  <vmakarov@redhat.com>

     * Makefile.in (LRA_INT_H): New.
     (OBJS): Add lra.o, lra-assigns.o, lra-coalesce.o,
     lra-constraints.o, lra-eliminations.o, lra-lives.o, and lra-spills.o.
     (ira.o): Add dependence on lra.h.
     (lra.o, lra-assigns.o, lra-coalesce.o, lra-constraints.o): New entries.
     (lra-eliminations.o, lra-lives.o, lra-spills.o): Ditto.
     * ira.c: Include lra.h.
     (ira_init_once, ira_init, ira_finish_once): Call lra_start_once,
     lra_init, lra_finish_once in anyway.
         (lra_in_progress): Remove.
     (do_reload): Call LRA.
     * lra.h: New.
     * lra-int.h: Ditto.
     * lra.c: Ditto.
     * lra-assigns.c: Ditto.
     * lra-constraints.c: Ditto.
     * lra-coalesce.c: Ditto.
     * lra-eliminations.c: Ditto.
     * lra-lives.c: Ditto.
     * lra-spills.c: Ditto.
     * doc/passes.texi: Describe LRA pass.

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