LLVM 14

[finagolfin]

Start building the latest LLVM release, along with more tools and targets.

[finagolfin]

Alright, this is ready to go: please download the zip files from the last CI run and test on your own device, pinging @Grimler91 and everyone else to try them out. I have tested out the AArch64 packages and they work well.

The only noticeable differences should be that the scudo sanitizer is not built, llvm/llvm-project@3d4d1b9, (which we could enable again if wanted) and the compiler-rt libraries have been moved.

Once this is in, Rust will need to be bumped separately and I will update Swift to 5.6 soon. I see five other packages that now link against libllvm and will probably need to be bumped: ccls, iwyu, odin, wasmedge, and zig.

@xtkoba, if you get #8192 ready and let me know, I will pull that commit in here.

[finagolfin]

@nikey02, I have put together the mlir package you asked for last year: you can download the latest LLVM 14 packages in a zip file from the latest CI run, remove your existing LLVM 13 packages with apt remove libllvm, and install these with dpkg -i *14.0.0_aarch64.deb. Test them out and let us know of any problems.

[finagolfin]

Compiler-rt moved where it places its libraries by default, llvm/llvm-project@a68ccba, so change this and the Driver change above is no longer needed.

[finagolfin]

If there is no complaint, I will merge this in a couple hours, then we can get #9911 in and bump the LLVM-dependent packages I listed.

I've had Swift 5.6 ready for more than a month now for aarch64 and x86_64, but building the compiler for armv7 broke last year. I'll take one last shot at that compile-time error today and merge with armv7 disabled if not, help welcome as I avoid C++.