[split] Add CFI ops, fix call/return prediction, other changes

[Richard Henderson]

On 09/30/2009 09:03 AM, Ross Ridge wrote:
> 	foo:
> 		# ...
> 		jg	L
> 		# ...
> 		call	__morestack
> 		call	L
> 		jmp	__releasestack
> 	L:
> 		# ...

This option does not have proper unwind info.


r~