minor optimization for Xtensa BFD

[Bob Wilson]

This patch avoids some redundant iteration over lists and generally cleans up a 
few bits of code.  Committed on trunk.

2007-10-05  Bob Wilson  <bob.wilson@acm.org>
	
	* elf32-xtensa.c (removed_by_actions): New.
	(offset_with_removed_text): Reimplement using removed_by_actions.
	(offset_with_removed_text_before_fill): Delete.
	(relax_property_section): Use removed_by_actions.  Rearrange logic.
	(relax_section_symbols): Likewise.
	
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