[PATCH] gold: make the kept comdat structure have a direct link to sections map

[Mikolaj Zalewski]

  Currently, if a comdat is already declared in a previous object and
we need to access its sections, Layout needs to map the comdat name to
original object/section index and the obejct must map section the
index to comdat information. With this patch, the Layout's
Kept_section structure has already all the information about the
comdat. The patch also changes the way comdat information is accessed
- it only does one insert, instead of an insert and if insert failed
then a find for the entry. This decreased linking CPU time on a sample
test by 2-2,5%. It produces the same binary as the previous version
and make check passed.

2009-02-27  Mikolaj Zalewski  <mikolajz@google.com>
	* layout.cc (find_or_add_comdat): a more generic version of add_comdat
	(add_comdat): removed
	* layout.h (Kept_section): move out of Layout
	(Kept_section::group_sections_): new field
	(Layout::Kep_section): remove
	(find_or_add_comdat): a more generic version of add_comdat
	(add_comdat): removed
	* object.cc (include_section_group): use find_or_add_comdat and
Kept_section::group_sections_
	(include_linkonce_section): use find_or_add_comdat and
Kept_section::group_sections_
	* object.cc (Comdat_group): removed
	(Comdat_group_table): removed
	(find_comdat_grouop): removed
	(add_comdat_group): removed
	(comdat_groups_): removed
	* plugin.cc (include_comdat_group): use the new Layout::find_or_add_comdat
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