[12/21] Trim XCOFF symbols earlier in the link process

[Nick Clifton]

Hi Richard,

> bfd/
> 	* libcoff-in.h (xcoff_tdata): Change debug_indices to a signed long.
> 	* libcoff.h: Regenerate.
> 	* xcofflink.c (xcoff_keep_symbol_p): New function, using the
> 	"skip" logic from xcoff_link_input_bfd.
> 	(bfd_xcoff_size_dynamic_sections): Explicitly skip dynamic
> 	objects in a dynamic link, rather than checking whether csectpp
> 	is null.  Always allocate debug_index for other objects,
> 	and always go through the loop.  Update the type of debug_index
> 	after the change above.  Read the auxillary csect information
> 	and use xcoff_keep_symbol_p to decide whether a symbol should
> 	be kept.  Set its debug_index to -2 if not.
> 	(xcoff_link_input_bfd): Update the type of debug_index after
> 	the change above and always expect it to be nonnull.  Use it to
> 	test whether a symbol should be stripped, rather than making the
> 	decision here.  Postpone all symbol creation to the second pass.

Approved - please apply.

Cheers
   Nick