[Xtensa] handle unordered floating-point comparisons

[Bob Wilson]

I recently discovered that I never added support for unordered comparisons in 
the Xtensa port.  I've committed the following to fix that.  I tested xtensa-elf 
builds both with and without the Xtensa floating-point option to verify that it 
causes no regressions.

2008-03-27  Bob Wilson  <bob.wilson@acm.org>

	* config/xtensa/xtensa.c (gen_float_relational): Handle unordered
	comparisons.
	* config/xtensa/xtensa.md (any_cond): Add unordered comparisons.
	(any_scc_sf): Add uneq, unlt, unle and unordered operators.
	(scc_sf): New.
	(s<code>_sf): Use new scc_sf attribute for opcode names.
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