Use Boyer-Moore for indexOfBytes and indexOfCP when needle is constant

[mattBoros]

https://jira.mongodb.org/browse/SERVER-26752

I doubt I followed the code standards exactly, but I think this will work.

[carlchampain]

Thanks for making this pull request! We just need you to sign our Contributor's Agreement as part of our considering the PR.

[mattBoros]

No problem! I just completed and submitted the form.

[carlchampain]

Hi @mattBoros! I can't find your name in our internal list of contributors. Can you ensure that the form went through?

[mattBoros]

Hi! I received a receipt shortly after signing the form. I realize I used my full first name Matthew instead of Matt. Could this be the issue?

[carlchampain]

I still can't find you in the list. I tried your full name and your Github username. Can you try signing the agreement one more time?

[mattBoros]

No problem! I just signed the agreement and it sent me a receipt email.

[carlchampain]

@mattBoros, we have received your signature. Thank you!