[Xtensa] speed up assembler for large inputs

[Bob Wilson]

I've committed this patch from Sterling Augustine to fix a performance problem 
for large input files.  The code was O(N^2).  The patch simply records the 
position of a frag to avoid searching repeatedly for the right position.  I 
verified that it causes no testsuite regressions for an xtensa-elf target.

2007-06-19  Sterling Augustine  <sterling@tensilica.com>

	* config/tc-xtensa.h (struct xtensa_frag_type): Update comment about
	use of literal_frag field.
	* config/tc-xtensa.c (xtensa_mark_literal_pool_location): Record frag
	in the literal_frag field.
	(xtensa_move_literals): Use it here instead of searching.  Update
	literal_frag field with new value.

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