final fix for Xtensa linkonce DWARF issue

[Bob Wilson]

Here is the Xtensa-specific piece of the change to fix the issue described 
earlier (http://sourceware.org/ml/binutils/2007-10/msg00100.html).  Compared to 
the previous version, I added the same check for the section sizes that went 
into the _bfd_elf_check_kept_section function.  Otherwise, it's the same.  I 
retested everything together.  Committed on the trunk.

2007-10-16  Bob Wilson  <bob.wilson@acm.org>

	* elf32-xtensa.c (relax_section): Check for a reference to a discarded
	DWARF section and anticipate its replacement with the kept section.
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