check for invalid Xtensa instructions

[Bob Wilson]

I've committed this patch to check for Xtensa instructions that are invalid 
because they contain more than one access to hardware interfaces that are 
related (e.g., for hardware queues).


2004-11-12  Bob Wilson  <bob.wilson@acm.org>

include/ChangeLog
	* xtensa-isa-internal.h (xtensa_interface_internal): Add class_id.
	* xtensa-isa.h (xtensa_interface_class_id): New prototype.

bfd/ChangeLog
	* xtensa-isa.c (xtensa_interface_class_id): New.

gas/ChangeLog
	* config/tc-xtensa.c (finish_vinsn): Clear pending instruction if
	there is a conflict.
	(check_t1_t2_reads_and_writes): Check for both reads and writes to
	interfaces that are related as determined by xtensa_interface_class_id.

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