RFA: MN10300: Add support for LIW instructions

[Nick Clifton]

Hi Richard,

   Thanks very much for the patch review.  Attached is a revised version 
with all of the points you raised addressed.

   Still no regressions with an mn10300-elf toolchain.

   OK to apply ?

Cheers
   Nick

gcc/ChangeLog
2011-01-27  Nick Clifton  <nickc@redhat.com>

	* config/mn10300/mn10300.opt (mliw): New command line option.
	* config/mn10300/mn10300.md (UNSPEC_LIW): New unspec.
	(liw_bundling): New automaton.
	(liw): New attribute.
	(liw_op): New attribute.
	(liw_op1, liw_op2, liw_both, liw_either): New reservations.
	(movsi_internal): Add LIW attributes.
	(andsi3): Likewise.
	(iorsi3): Likewise.
	(xorsi3): Likewise.
	(addsi3): Separate register and immediate alternatives.
	Add LIW attributes.
	(subsi3): Likewise.
	(cmpsi): Likewise.
	(aslsi3): Likewise.
	(lshrsi3): Likewise.
	(ashrsi3): Likewise.
	(liw): New pattern.
	* config/mn10300/mn10300.c (liw_op_names): New
	(mn10300_print_operand): Handle 'W' operand descriptor.
	(extract_bundle): New function.
	(check_liw_constraints): New function.
	(liw_candidate): New function.
	(mn10300_bundle_liw): New function.
	(mn10300_reorg): New function.
	(TARGET_MACHINE_DEPENDENT_REORG): Define.
	(TARGET_DEFAULT_TARGET_FLAGS): Add MASK_ALLOW_LIW.
	* config/mn10300/mn10300.h (TARGET_CPU_CPP_BUILTINS): Define
	__LIW__ or __NO_LIW__.
	* doc/invoke.texi: Describe the -mliw command line option.
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