[PATCH] PowerPC thread pointer bias requires powerpc/lowlevelrobustlock.sym

[Ryan S. Arnold]

I've been sitting on this patch for way too long.  

The TID implementation in the default lowlevelrobustlock.sym is wrong
for PowerPC.  The thread point on PowerPC is biased by -0x7000 to extend
the size of the FAST TLS to 64KB.  This patch provides a powerpc
implementation to take this into account.

Ryan S. Arnold
IBM Linux Technology Center
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