Improved shared LWS/GWS test (see 261d7b1).
Revert to using 4x for SIMD SHA-1, for gcc >= 4.7 unless AVX or XOP.
Merge branch 'bleeding-jumbo' into memdbg

* bleeding-jumbo:
  Revert to using 4x for SIMD SHA-1, for gcc >= 4.7 unless AVX or XOP.
  Improved shared LWS/GWS test (see 261d7b1).