Welcome LLVM 12 (12.0.0rc2) to the tree
Notable *port* changes (vs devel/llvm11):
- Switch to single llvm-project distfile. This simplifies the port and support for the old style build process is rotting upstream after the mono-repo conversion.
- Disable libedit dependency in libLLVM (still used by LLDB). This is one small step toward a dependency-less clang.
- LLDB docs are disabled due to issues finding python includes when autogenerating API docs.
Sponsored by: DARPA