config.gcc (powerpc*-*-*): Handle a2.

config.gcc (powerpc*-*-*): Handle a2.

	* config.gcc (powerpc*-*-*): Handle a2.
	* config/rs6000/rs6000.md (cpu): Add ppca2.  Include "a2.md".
	* config/rs6000/a2.md: New file.
	* config/rs6000/rs6000.opt (mno-update): New.
	(mupdate): Return to using a mask, not a var.
	* config/rs6000/rs6000.h (ASM_CPU_SPEC): Add support for a2.
	(enum processor_type): Add PROCESSOR_PPCA2.
	* config/rs6000/rs6000.c (ppca2_cost): New costs.
	(rs6000_override_options): Add "a2" to processor_target_table.
	Update rs6000_always_hint logic.  Correctly set rs6000_cost for
	a2.
	* doc/invoke.texi (RS/6000 and PowerPC Options): Document
	-mcpu=a2.

From-SVN: r152499