[Xtensa] GAS relaxation not terminating

[Bob Wilson]

I've committed this patch from Sterling Augustine.  It fixes a case where Xtensa 
wide branch opcodes cause the assembler's relaxation to iterate forever.

2007-06-22  Sterling Augustine  <sterling@tensilica.com>

	* config/tc-xtensa.c (xg_assembly_relax): Comment termination rules.
	(frag_format_size): Handle RELAX_IMMED_STEP3.
	(xtensa_relax_frag, md_convert_frag): Likewise.
	* config/tc-xtensa.h (xtensa_relax_statesE): Add RELAX_IMMED_STEP3.
	(RELAX_IMMED_MAXSTEPS): Adjust.
	* config/xtensa-relax.c (widen_spec_list): Add transitions from
	wide branches to branch-over-jumps.
	(build_transition): Handle wide branches in transition patterns.
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