[committed] Update config/pa/linux-atomic.c to use new subword and double word atomic support

[John David Anglin]

The attached change updates the linux atomic support to use the new  
kernel calls for subword and
double word types.

Tested on hppa-unknown-linux-gnu and committed to trunk.

The majority of this change, including the kernel patch, was  
contributed by Guy Martin.

Dave
--
John David Anglin	dave.anglin@bell.net


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