Fix crash when assigning to bool class fields

[alangpierce]

Fixes #94

With Type.bool, size is 1, so dividing by 8 isn't the right way to convert to
byteSize. Instead, we need to use the byteSize property that does the proper
ceiling division.

I left out the allocation from the test so that the resulting wat files are
easier to read.

[alangpierce]

@dcodeIO I see that the dist files are in source control and a number of your recent changes update them, but the contributing guidelines say to exclude them. Should I be updating them in PRs or leaving them out? Maybe they should just be removed from source control and added to gitignore?

[MaxGraey]

dist files needs for external tools like WebAssembly Studio which download relevant version. But you shoudn't update it in PR.

[alangpierce]

Got it, so the contributing docs (https://github.com/AssemblyScript/assemblyscript/blob/master/CONTRIBUTING.md#submitting-pull-requests) are out of date? I guess when this project gets published to npm, WebAssembly Studio can just use that instead of relying on dist files in the repo?

[MaxGraey]

This better ask to @dcodeIO.

[alangpierce]

Ok, I updated the commit to include dist file updates as well (just the result of npm run build).

[alangpierce]

Oh, funny, the build failed with "The pull request includes changes to distribution files, but it shouldn't."

I'll leave them out I suppose.

[MaxGraey]

No, you should exclude dist files) So everything was alright before

But you shoudn't update it in PR.

[alangpierce]

@dcodeIO updated to include a load in the test case as well.

[dcodeIO]

Thank you! :)