Fix nits about -frename-registers

[Eric Botcazou]

process_options contains first

   if (flag_rename_registers == AUTODETECT_VALUE)
     flag_rename_registers = flag_unroll_loops || flag_peel_loops;

and then

  if (flag_rename_registers == AUTODETECT_VALUE)
    flag_rename_registers = default_debug_hooks->var_location
	    		    != do_nothing_debug_hooks.var_location;

so the second test is never true.  And the docs aren't up-to-date either.

Tested on i586-suse-linux, applied on the mainline.


2009-11-17  Eric Botcazou  <ebotcazou@adacore.com>

	* toplev.c (process_options): Remove dead code.
	* doc/invoke.texi (-frename-registers): Mention -fpeel-loops.


-- 
Eric Botcazou
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