Solana compiles via rustc

For the first time in Solana history, we can generate Solana programs directly from upstream rustc and LLVM! Starting with sbpf-linker 0.2.3, you can compile a no_std Solana program with just cargo +nightly build, and voilà! ✨ Anything that doesn't work should be considered a bug, and I'll fix it! I've chewed through all the compiler and assembly glass so you don't have to. The only thing left for you is to learn Rust properly. Below is a quick guide to .cargo/config.toml 101 and Solana libcalls