Test for functional argument passing

[directionless]

Tests for #322

(And a .gitignore addition for llvm)

[directionless]

I suspect this should fail tests, I think #322 merged into dev, not master.

[deadprogram]

Hi @directionless thanks for the PR I changed the branch for it to dev as mentioned here: https://github.com/tinygo-org/tinygo/blob/master/CONTRIBUTING.md#how-to-use-our-github-repository

[aykevl]

Can you merge these tests in calls.go? By having fewer larger tests, the time to run them is reduced (certainly as long as #285 is not finished).
Also, can you use println instead of fmt.Println? By avoiding this fmt package, tests are much faster to execute because they compile faster. This test isn't about the fmt package but only about named functions.

I care a lot about fast tests because the slower the test, the less likely you are to run them.

[directionless]

Sure. I'm happy to merge this with calls.go.

My bias is also to faster tests, though in my other go projects I haven't found fewer files to be as much of a win. But I also use a lot of parallelization. I tossed a bunch of stuff into #337 around that. On my machine, it seems to cut the test time in half. I'm curious what you think of that approach.

[deadprogram]

Thanks for the additional tests @directionless now merging.

[aykevl]

Technically varargs are a matter for the frontend (https://godoc.org/golang.org/x/tools/go/ssa) because on the Go SSA level, all varargs are replaced with slices already so doesn't really need to care about this, but it's good to test it anyway to be sure.