[PATCH] Optimized strncmp for PPC32 & PPC64

[Steve Munroe]

Resubmitting this patch with the change log in the attachment. Hopefully 
this will prevent mozilla or relay.us.ibm.com from mundging the tabs.

Currently PPC32/64 use the generic/strncmp.c implementation. This shows 
up in a recent benchmark as 25% of the total execution. The attached asm 
implementations give a 15-18% improvement over the generic code.
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