patch applied (packages/base): Add throwSTM :: Exception e => e -> STM a

[Simon Marlow]

Ian, could we merge this one?

On 20/10/2010 15:02, Simon Marlow wrote:
> Sun Sep 26 12:21:44 PDT 2010  Bas van Dijk<v.dijk.bas at gmail.com>
>    * Add throwSTM :: Exception e =>  e ->  STM a
>
>      M ./GHC/Conc.lhs +1
>      M ./GHC/Conc/Sync.lhs +22

it is needed for stm-2.2.0.0 and doesn't affect any public APIs.

Cheers,
	Simon