Updated nvvm codegen to 1.72.0 nightly.

[ZelboK]

As title says I updated and built the crate. Problem is that I'm both a beginner in Rust and LLVM. This is my first rust project.

Things compile for now, I prioritized just getting things to compile so some methods implemented are left in a todo state. I'll eventually make a PR when I have time but for now if anyone is interested you can check my profile to see the repo.

Currently running into this:

  warning: `cuda_std_macros` (lib) generated 2 warnings (run `cargo fix --lib -p cuda_std_macros` to apply 2 suggestions)
     Compiling rustc-std-workspace-core v1.99.0 (C:\Users\devel\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\rustc-std-workspace-core)
     Compiling alloc v0.0.0 (C:\Users\devel\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\alloc)
  error: could not compile `core` (lib)

  Caused by:
    process didn't exit successfully: `rustc --crate-name core --edition=2021 C:\Users\devel\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no --cfg "feature=\"panic_immediate_abort\"" -C metadata=2eed41a84448bb8c -C extra-filename=-2eed41a84448bb8c --out-dir C:\Users\devel\Rust-CUDA\target\cuda-builder\nvptx64-nvidia-cuda\release\deps --target nvptx64-nvidia-cuda -Z force-unstable-if-unmarked -L dependency=C:\Users\devel\Rust-CUDA\target\cuda-builder\nvptx64-nvidia-cuda\release\deps -L dependency=C:\Users\devel\Rust-CUDA\target\cuda-builder\release\deps --cap-lints allow -Zcodegen-backend=C:\Users\devel\Rust-CUDA\target\debug\deps\rustc_codegen_nvvm.dll -Zcrate-attr=feature(register_tool) -Zcrate-attr=register_tool(rust_cuda) -Zcrate-attr=no_std "-Cllvm-args=-arch=compute_61 --override-libm"` (exit code: 0xc0000005, STATUS_ACCESS_VIOLATION)
  warning: build failed, waiting for other jobs to finish...
  thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: BuildFailed', examples\cuda\cpu\add\build.rs:7:10
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

As per @RDambrosio016 suggested, I plan on building LLVM 7 from source and enabling debug assertions. If anyone is interested in helping please lmk.

[ZelboK]

Also I pulled in @apriori 's PR and worked on top of that.