Vidya Ranganathan e65caf1f1d PowerPC: strspn optimization for PPC64/POWER7
The optimization is achieved by following techniques:
  > hashing of needle.
  > hashing avoids scanning of duplicate entries in needle across the string.
  > initializing the hash table with Vector instructions (VSX) by quadword access.
  > unrolling when scanning for character in string across hash table.
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