perf-toolbox / tir / 9033076762

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feat: add LIT-style tests (#46)

The new "check" tests are a convenient way to test various parts of the compiler stack, similar to LLVM Integrated tests.
There're two ways to run check tests:
```sh
cargo build
cargo run --bin check-runner
```

or a more convenient:

```
cargo install cargo-make
cargo make check
```

The syntax of check tests is very similar to what LIT can accept, however, the functionality is currently
limited to RUN directive only.

This commit also provides a `filecheck` utility, that is a replica of LLVM's `FileCheck` in both syntax
and CLI usage.

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