gold patch committed: Fix descriptor handling

[Ian Lance Taylor]

I managed to mess up the simple-minded stack of open file descriptors in
gold.  I committed this patch to make it slightly less simple-minded.

Ian


2009-02-27  Ian Lance Taylor  <iant@google.com>

	PR 5990
	* descriptors.h (Open_descriptor): Add is_on_stack field.
	* descriptors.cc (Descriptors::open): If the descriptor is on the
	top of the stack, remove it.  Initialize is_on_stack field.
	(Descriptors::release): Only add pod to stack if it is not on the
	stack already.
	(Descriptors::close_some_descriptor): Clear stack_next and
	is_on_stack fields.


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