stdlib: remove Boolean protocol

[gribozavr]

Per SE-0109.

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[gribozavr]

@swift-ci Please test

[lattner]

Thanks Dmitri, but I was already working on this, and it just landed.

[gribozavr]

@lattner No problem, but this PR also removes the Bool.boolValue API, which we don't need anymore. I'll refresh the PR.

[lattner]

I'm pretty sure that I removed Bool.boolValue, but please feel free to clean up anything you think should be improved.

[gribozavr]

@lattner It is still referenced in validation-test/stdlib/FixedPoint.swift.gyb for example, and other places.

[lattner]

I just removed that as part of fixing the validation tests.

[gribozavr]

@lattner I see now. OK, I call this PR a grab bag of cleanups then.

[lattner]

SGTM, thanks! Sorry for stepping on your toes. I'm done touching bool stuff. :-)

[gribozavr]

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[gribozavr]

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[gribozavr]

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