Implements bar.red.and.pred and bar.red.or.pred, using the undocument __ockl_wgred functions. Doesn't yet add support for numbered barriers and threadcount, as these are not needed for llm.c.
* LLVM unit tests: add assembly files
* LLVM unit tests: first attempt
* LLVM unit tests: fix - parse bitcode in context
* LLVM unit tests: use pretty_assertions for line-by-line diff
* LLVM unit tests: Write IR to file for failed test
* LLVM unit tests: just use the stack
* LLVM unit tests: use MaybeUninit
* LLVM unit tests: add mul24.ll
* LLVM unit tests: Adjustments after review
* LLVM unit tests: Include emit_llvm::Context in emit_llvm::Module
* LLVM unit tests: Fix typo
* LLVM unit tests: Context need not be pub
The overarching goal is to refactor all passes so they are module-scoped and not function-scoped. Additionally, make improvements to the most egregiously buggy/unfit passes (so the code is ready for the next major features: linking, ftz handling) and continue adding more code to the LLVM backend
