patch applied (ghc): Run sparks in batches, instead of creating a new thread for each one

[Don Stewart]

simonmarhaskell:
> Thu Nov  6 03:36:39 PST 2008  Simon Marlow <marlowsd at gmail.com>
>   * Run sparks in batches, instead of creating a new thread for each one
>   Signficantly reduces the overhead for par, which means that we can
>   make use of paralellism at a much finer granularity.
> 
>     M ./compiler/prelude/primops.txt.pp +6
>     M ./includes/StgMiscClosures.h +1
>     M ./rts/Capability.c -7 +22
>     M ./rts/Capability.h -1 +5
>     M ./rts/Linker.c +1
>     M ./rts/Prelude.h +1
>     M ./rts/PrimOps.cmm +22
>     M ./rts/Schedule.c -30 +4
>     M ./rts/Sparks.c -4 +6
>     M ./rts/Sparks.h -2 +2
>     M ./rts/package.conf.in -5 +3

AWESOME