utils: optimize murmur3_hash data fetch
utils: optimize murmur3_hash data fetch

By using a recognized idiom, gcc can optimize the unaligned little endian
load as a single instruction (actually less than an instruction, as it
combines it with a succeeding arithmetic operation).

tempbottle/scylla,guiquanz/scylla,rentongzhang/scylla,rluta/scylla,asias/scylla,phonkee/scylla,rluta/scylla,gwicke/scylla,bowlofstew/scylla,duarten/scylla,aruanruan/scylla,respu/scylla,raphaelsc/scylla,phonkee/scylla,duarten/scylla,capturePointer/scylla,stamhe/scylla,eklitzke/scylla,senseb/scylla,linearregression/scylla,aruanruan/scylla,victorbriz/scylla,eklitzke/scylla,tempbottle/scylla,duarten/scylla,linearregression/scylla,linearregression/scylla,respu/scylla,wildinto/scylla,capturePointer/scylla,acbellini/scylla,kjniemi/scylla,justintung/scylla,glommer/scylla,rluta/scylla,scylladb/scylla,aruanruan/scylla,rentongzhang/scylla,phonkee/scylla,senseb/scylla,stamhe/scylla,avikivity/scylla,avikivity/scylla,stamhe/scylla,wildinto/scylla,victorbriz/scylla,senseb/scylla,scylladb/scylla,asias/scylla,kangkot/scylla,asias/scylla,scylladb/scylla,respu/scylla,guiquanz/scylla,eklitzke/scylla,gwicke/scylla,wildinto/scylla,victorbriz/scylla,kangkot/scylla,shaunstanislaus/scylla,guiquanz/scylla,glommer/scylla,scylladb/scylla,acbellini/scylla,bowlofstew/scylla,tempbottle/scylla,dwdm/scylla,shaunstanislaus/scylla,glommer/scylla,shaunstanislaus/scylla,gwicke/scylla,bowlofstew/scylla,dwdm/scylla,rentongzhang/scylla,kangkot/scylla,acbellini/scylla,raphaelsc/scylla,justintung/scylla,kjniemi/scylla,justintung/scylla,avikivity/scylla,kjniemi/scylla,dwdm/scylla,raphaelsc/scylla,capturePointer/scylla