i965/sf: Drop useless push/pop state from flag register mashing code.
i965/sf: Drop useless push/pop state from flag register mashing code.

There's no point in pushing and popping the default state; the code
between the two stack operations doesn't alter anything.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

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