[Xtensa] move macros into functions

[Bob Wilson]

This patch replaces some big macros in xtensa.h with calls to equivalent 
functions in xtensa.c.  Tested with an xtensa-elf build and committed on the 
mainline.

2007-02-02  Bob Wilson  <bob.wilson@acm.org>

	* config/xtensa/xtensa.c (smalloffset_mem_p): Use BASE_REG_P.
	(xtensa_legitimate_address_p): New.
	(xtensa_legitimize_address): New.
	(xtensa_output_addr_const_extra): New.
	* config/xtensa/xtensa.h (REG_OK_STRICT_FLAG): Define.
	(BASE_REG_P): New.
	(REG_OK_FOR_BASE_P): Use BASE_REG_P.
	(GO_IF_LEGITIMATE_ADDRESS): Move code to xtensa_legitimate_address_p.
	(LEGITIMIZE_ADDRESS): Move code to xtensa_legitimize_address.
	(OUTPUT_ADDR_CONST_EXTRA): Move code to xtensa_output_addr_const_extra.
	* config/xtensa/xtensa-protos.h (xtensa_legitimate_address_p): New.
	(xtensa_legitimize_address): New.
	(xtensa_output_addr_const_extra): New.

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