Fix bug in plugin section ordering infrastructure when layout is deferred.

[Sriraman Tallam <tmsriram at google dot com>]

Hi,

   Currently, the plugin section ordering infrastructure does not do
the right thing when layout is deferred. This happens when garbage
collection or icf is done. The --section-ordering-file works fine
because it updates section order only after layout is done.  This
patch fixes this problem by delaying the update of the section order
of input sections until layout has all the output sections.

Thanks,
-Sri.

	* layout.h (section_order_map_): New member.
	(get_section_order_map): New member function.
	* output.cc (Output_section::add_input_section): Check for patterns
	only when --section-ordering-file is specified.
	* gold.cc (queue_middle_tasks): Delay updating order of sections till
	output_sections have been formed.
	* layout.cc (Layout_Layout): Initialize section_order_map_.
	* plugin.cc (update_section_order): Store order in order_map. Do not
	update the order.

Attachment: gold_patch.txt
Description: Text document