[lra] patch fixing code formatting and adding comments

[Vladimir Makarov]

The following pretty big patch mostly adds comments, fixes old comments 
and code format.

The patch also fixes calls of alter_subreg in machine dependent files.

Committed as rev. 190447.

2012-08-16  Vladimir Makarov  <vmakarov@redhat.com>

         * lra.h: Format the code, tabify.  Fix and add comments.
         * lra-int.h: Ditto.
         * lra.c: Ditto.
         * lra-assigns.c: Ditto.
         * lra-constraints.c: Ditto.
         * lra-coalesce.c: Ditto.
         * lra-eliminations.c: Ditto.
         * lra-equivs.c: Ditto.
         * lra-lives.c: Ditto.
         * lra-spills.c: Ditto.

         * config/pa/pa.c: Add argument to alter_subreg calls.
         * config/v850/v850.c: Ditto.
         * config/sh/sh.md: Ditto.
         * config/arm/arm.c: Ditto.
         * config/xtensa/xtensa.c: Ditto.
         * config/m68k/m68k.c: Ditto.
         * config/m32r/m32r.c: Ditto.

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