Hello,

Given that the number of LLVM packages is growing, and probably will
grow again (I'm introducing "offload" right now, expect at least MLIR
soon, there are open requests for flang, polly...), I'd like to propose
creating dedicated categories for these packages and moving them there.

If not anything else, this will help consistently applying flags
and keywords to these packages (`/etc/portage/package.*` accept
wildcards).

My initial idea would be to use two categories: one for the toolchain
packages, another for runtimes, e.g.:

llvm-core/
  clang
  clang-common
  clang-runtime
  clang-toolchain-symlinks
  lld
  lld-toolchain-symlinks
  lldb
  llvm
  llvm-common
  llvm-toolchain-symlinks
  llvmgold

llvm-runtimes/
  compiler-rt
  compiler-rt-sanitizers
  libclc
  libcxx
  libcxxabi
  libomp (-> openmp?)
  llvm-offload (-> offload)
  llvm-unwind (-> unwind?)

clang-python, lit and llvm-ocaml would remain in their language
categories.

WDYT?

-- 
Best regards,
Michał Górny