remove dead code in Xtensa GAS port

[Bob Wilson]

It looks like some as_warn calls were at some point converted to as_fatal 
without accounting for the fact that as_fatal doesn't return.  I've committed 
this patch to remove dead code following calls to as_fatal.  Tested with an 
xtensa-elf build.

gas/
	* config/xtensa-relax.c (build_transition): Remove code after as_fatal.
	(build_transition_table): Likewise.

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