* pa.c (update_total_code_bytes): New function.
	(last_address): Number of bytes output for a function and its
	associated thunks.
	(compute_frame_size): Use BITS_PER_UNIT.
	(pa_output_function_epilogue): Compute last_address.  Use
	update_total_code_bytes.
	(output_lbranch): Handle long branch on portable runtime.
	(attr_length_millicode_call, attr_length_call,
	attr_length_indirect_call): Only use total_code_bytes for calls in
	the text section.
	(output_call): Only use an indirect call sequence when the target is
	not local.
	(pa_asm_output_mi_thunk): Handle updating of total_code_bytes.  Improve
	test to determine when an IA-relative branch can be used.  Add various
	long branch sequences.  Avoid using an indirect branch on all ports
	except SOM.

From-SVN: r68677