What are the top LLVM repos?

Popular LLVM repositories on GitHub, each answered in plain English for non-coders: what it is, its tech stack, and how to run it.

llvm/llvm-projectA large collection of compiler building blocks — including the Clang C/C++ compiler and the LLVM optimizer — t
llvm-mirror/llvmLLVM is an archived mirror of the compiler infrastructure toolkit used to build optimizing compilers, code opt