[new-regalloc] Add the comments from HEAD

[Michael Matz <matz at suse dot de>]

Hi,

this just adds all the comments I already added to HEAD, and removes some
#if 0 code.  It still bootstraps without regresssions on i686-linux.


Ciao,
Michael.
-- 
2002-07-11  Michael Matz  <matz@suse.de>

        * ra.c (flag_ra_improved_spilling): New.
        * ra.h (flag_ra_improved_spilling): Declare.
        * ra-rewrite.c (actual_spill): Use it, and call rewrite_program().

2002-06-27  Michael Matz  <matz@suse.de>

        * toplev.c (flag_new_regalloc): Add comment.
        * df.c (df_insn_table_realloc): Size param is absolute.
        * Makefile.in: Clean up header dependencies for ra*.o
        * doc/invoke.texi: Document -fnew-ra.
        * ra.c: Add comments everywhere.  Delete some #if 0'ed code.
        * ra.h: Ditto.
        * ra-build.c: Ditto.
        * ra-colorize.c: Ditto.
        * ra-debug.c: Ditto.
        * ra-rewrite.c: Ditto.

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