Speed up reading/writing slices with #[inline]
Speed up reading/writing slices with #[inline]

When built with `rustc -O`:

before:

test bench_read_slice  ... bench:        68 ns/iter (+/- 56)
test bench_read_vec    ... bench:        78 ns/iter (+/- 21)
test bench_write_slice ... bench:       133 ns/iter (+/- 46)
test bench_write_vec   ... bench:       308 ns/iter (+/- 69)

after:

test bench_read_slice  ... bench:        32 ns/iter (+/- 10)
test bench_read_vec    ... bench:        32 ns/iter (+/- 8)
test bench_write_slice ... bench:        53 ns/iter (+/- 12)
test bench_write_vec   ... bench:       247 ns/iter (+/- 172)

zubron/rust,mihneadb/rust,pshc/rust,jashank/rust,GBGamer/rust,GBGamer/rust,mihneadb/rust,vhbit/rust,seanrivera/rust,ejjeong/rust,TheNeikos/rust,XMPPwocky/rust,dwillmer/rust,ebfull/rust,pshc/rust,avdi/rust,victorvde/rust,KokaKiwi/rust,ejjeong/rust,zachwick/rust,l0kod/rust,rohitjoshi/rust,ebfull/rust,philyoon/rust,cllns/rust,zubron/rust,andars/rust,carols10cents/rust,XMPPwocky/rust,mdinger/rust,sae-bom/rust,omasanori/rust,dwillmer/rust,kwantam/rust,robertg/rust,cllns/rust,seanrivera/rust,miniupnp/rust,rohitjoshi/rust,victorvde/rust,XMPPwocky/rust,pshc/rust,ruud-v-a/rust,nwin/rust,sae-bom/rust,sae-bom/rust,mdinger/rust,andars/rust,aneeshusa/rust,cllns/rust,zachwick/rust,nwin/rust,dwillmer/rust,sae-bom/rust,zubron/rust,aneeshusa/rust,ebfull/rust,cllns/rust,zaeleus/rust,reem/rust,robertg/rust,graydon/rust,avdi/rust,ejjeong/rust,TheNeikos/rust,mvdnes/rust,pshc/rust,kwantam/rust,pshc/rust,carols10cents/rust,graydon/rust,philyoon/rust,andars/rust,philyoon/rust,TheNeikos/rust,vhbit/rust,gifnksm/rust,aepsil0n/rust,vhbit/rust,krzysz00/rust,GBGamer/rust,jroesch/rust,avdi/rust,zubron/rust,miniupnp/rust,zubron/rust,jroesch/rust,nwin/rust,gifnksm/rust,reem/rust,mvdnes/rust,rohitjoshi/rust,KokaKiwi/rust,avdi/rust,aidancully/rust,KokaKiwi/rust,miniupnp/rust,mvdnes/rust,philyoon/rust,carols10cents/rust,zachwick/rust,robertg/rust,XMPPwocky/rust,pelmers/rust,gifnksm/rust,dwillmer/rust,carols10cents/rust,aidancully/rust,omasanori/rust,mdinger/rust,krzysz00/rust,seanrivera/rust,l0kod/rust,XMPPwocky/rust,seanrivera/rust,ebfull/rust,philyoon/rust,l0kod/rust,aneeshusa/rust,rohitjoshi/rust,GBGamer/rust,sae-bom/rust,aidancully/rust,sae-bom/rust,victorvde/rust,dwillmer/rust,vhbit/rust,KokaKiwi/rust,mdinger/rust,vhbit/rust,pelmers/rust,mvdnes/rust,gifnksm/rust,ejjeong/rust,cllns/rust,mdinger/rust,jroesch/rust,ejjeong/rust,nwin/rust,pelmers/rust,l0kod/rust,zubron/rust,reem/rust,zaeleus/rust,XMPPwocky/rust,carols10cents/rust,kwantam/rust,miniupnp/rust,philyoon/rust,jashank/rust,victorvde/rust,mdinger/rust,miniupnp/rust,pelmers/rust,nwin/rust,aidancully/rust,KokaKiwi/rust,ebfull/rust,jashank/rust,ebfull/rust,robertg/rust,krzysz00/rust,aepsil0n/rust,ruud-v-a/rust,reem/rust,pshc/rust,pelmers/rust,graydon/rust,aepsil0n/rust,TheNeikos/rust,mihneadb/rust,cllns/rust,krzysz00/rust,ruud-v-a/rust,graydon/rust,robertg/rust,l0kod/rust,reem/rust,andars/rust,seanrivera/rust,rohitjoshi/rust,dwillmer/rust,miniupnp/rust,jroesch/rust,aidancully/rust,zachwick/rust,jroesch/rust,vhbit/rust,dwillmer/rust,graydon/rust,mihneadb/rust,jroesch/rust,nwin/rust,TheNeikos/rust,jashank/rust,vhbit/rust,aepsil0n/rust,pshc/rust,pshc/rust,zachwick/rust,andars/rust,jashank/rust,nwin/rust,aneeshusa/rust,gifnksm/rust,reem/rust,omasanori/rust,aidancully/rust,carols10cents/rust,miniupnp/rust,nwin/rust,omasanori/rust,jashank/rust,zubron/rust,vhbit/rust,ruud-v-a/rust,GBGamer/rust,mvdnes/rust,andars/rust,TheNeikos/rust,mvdnes/rust,victorvde/rust,omasanori/rust,zubron/rust,jashank/rust,zaeleus/rust,l0kod/rust,zaeleus/rust,mihneadb/rust,l0kod/rust,jroesch/rust,rohitjoshi/rust,omasanori/rust,ruud-v-a/rust,zachwick/rust,l0kod/rust,ruud-v-a/rust,zaeleus/rust,kwantam/rust,krzysz00/rust,graydon/rust,seanrivera/rust,jashank/rust,jroesch/rust,gifnksm/rust,kwantam/rust,aneeshusa/rust,avdi/rust,dwillmer/rust,victorvde/rust,GBGamer/rust,kwantam/rust,GBGamer/rust,miniupnp/rust,pelmers/rust,GBGamer/rust,krzysz00/rust,zaeleus/rust,aepsil0n/rust,avdi/rust,KokaKiwi/rust,ejjeong/rust,mihneadb/rust,aepsil0n/rust,robertg/rust,aneeshusa/rust