[PATCH] TLS support for powerpc and powerpc64

[David Edelsohn]

	(legitimize_tls_address): New.
	(encode_tls_info): New.
	(get_some_local_dynamic_name): New.
	(get_some_local_dynamic_name_1): New.

	Is there a reason why some of the new functions do not have
"rs6000_" prepended to them?  If not, they should use the function naming
convention for consistency and to prevent name collisions in the future. 

Thanks, David